I’m not sure if this is an honest question or not, but I’ll treat it as such, even though you could answer your own question quite easily. The West is not complicit in the actions of the Iranian regime in any way that is similar to the situation with Israel. We are not arming the Iranians with the weapons they turn on civilians: very much not the case with Israel. Israel is treated like a normal state, whereas Iran is an international pariah and the subject of crippling sanctions. I could go on. The point is that westerners protest the actions of Israel because we believe we are part of the problem and that our protest might make a difference.

In fact, we believe - quite rightly - that if the US had conditioned military assistance to Israel on appropriate care for civilians, then the awful tragedy that unfolded in Gaza could have been averted. Similar levers for changing the behaviour of Iran do not exist.

Because the far worse Palestine massacre was perpetrated by an ally of the West, defended by western politicians and opinion makers, financed with western money and armed with western weapons. Then it makes sense to protest against your country's complicity.

Protesting in your country against an enemy country that has been subjected already to all kinds of sanctions and military attacks makes little sense.

There's nothing western governments can do to stop this. There are no demands western people are making to their western governments. While for Palestine, people want our governments to stop giving bombs to the attackers.

People have been protesting in the UK.

Fourteen arrested after protest at Iranian embassy: https://www.bbc.co.uk/news/articles/c5y3g8glgxvo

Protester climbs on to balcony of Iranian embassy in London: https://www.bbc.co.uk/news/articles/cy09yvd57x2o

Silent protestors gather in solidarity with Iran: https://www.bbc.co.uk/news/articles/cy4g1me23x7o

I don't remember my government sending bombs to the Ayatollah so they can keep carpe-bombing Tehran.

Protests serve to force your government to take action. i honestly at this point don't see what could mine to to stop this. Given the sanctions are not working, the only option to change Iran is maybe a direct intervention like Syria. And that sure worked great.

Because the western governments support Israel, thus a protests' goal is mainly aimed at changing that. How many westerns governments support Iran?

Because the people who funded and organized the pro-palestinian marches were backed partly by China and Iran.

There probably isn't the same awareness. This is the first I'm hearing of a massacre in Iran. It's so hard to keep up with the news these days and for many it's just recommended to avoid it because it's all outrage generation now. The EU has been massively occupied with threats to invade Greenland for the past month along with the subsequent media attention, so that has saturated the news cycle.

There has been protests organized by the Iranian diaspora in Germany.

Oh, no, not this false dichotomy again!

People protest to affect political change in their own countries. For example, that's why Americans now protest against ICE and not against the secret police in Turkmenistan. In my country, the government recently signed a secret arms deal with Israel to sell it weapons. Weapons that are then used to maim children. I don't like that. Major politicians have said that Israel should be "thanked" for what it's doing in Gaza. I don't like that either. Hence, why I protest. If the Sionazi regime in Israel was isolated in the same way as the Islamic regime in Iran or the Taliban regime in Afghanistan people would protest less because there would be less political change to affect.

This has been said before on here, but the main reason here is because in the West (particularly the US and Germany) there was a large group among the general populace supporting the genocide in Gaza, but in the West there is no large group supporting the massacre in Iran. The latter is an extremely fringe position to hold on the level of flat-earthers. People either don't care or are against it. When there's such a consensus, there's less controversy, less to talk about.

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Palestine had a ton of easily accessible video evidence, and not just from the victim's side but also lots of "hot takes" from the Israeli side as well, lots of talk from Israeli civilians and government officials about how there are no innocent civilians in Gaza and other deranged plainly genocidal remarks. In other words, there can be no reasonable doubt about what was going on and the only question really is who's side you're on.

With Iran, there's not a whole bunch of similar material, the death count estimates vary greatly from source to source, and we've got an untrustworthy president beating a war drum which probably makes people a bit more skeptical.. Atrocity propaganda to persuade a democracy to enter a war is something attentive people will be familiar with; incubator babies being tossed on the floor, dissidents being fed feet first into industrial grinders, people remember these stories preceding other wars and remember that evidence for the claims never materialized. Then there's the whole geopolitical angle where the Trump administration in fact supports Israel and Iran happens to be one of Israel's most powerful regional opponents. There are plenty of reasons to temper feelings of certainty.