That ignores the fact that there is a incredibly well founded coalition of organisations with idiological (climate change by its nature requires collective action, but collective action is bad...) and economic (big oil, big tobacco...) motivations that has been running a massive desinformation campaign for decades. We know desinformation is much easier than factual information, climate change is almost a poster boy for this. It would have not mattered an iorta if "environmentalists" would have used different messages, in fact they primarily used exactly the messages you proposed, the fact that you remember it as being ”you all have to suffer to save the planet" just shows how powerful the desinformation campaign was. Because that was their prime message, not the one of climate activists.