> This is not an example to what I asked for

Me: "Because people start shooting civilians thinking they're infiltrators, and even enemy civilians are protected persons."

You: "When did that happened in the Israel-Arab conflict?"

This was in the Israel-Arab conflict, and as you acknowledge, "wouldn't have happened if Hamas wore uniform". It is a perfectly responsive example to your request, and clearly illustrates the potential harm to innocent civilians from violations of the rule.