I heard someone say that academic attacks on Growth Mindset are irrelevant because it's such a strong meme people don't care about the research anymore.

Sometimes I hear people worry that, Trump supporters don't know of his misdeeds and say any report of those facts is a lie, so why even report on them anymore, why e.g. investigate his tax returns to see if he's still breaking tax laws, etc, if people won't even care?

This is a dangerous and sad way to think about the world. Maybe the world won't change. Maybe no one will be persuaded. But things move forward, and truth is important. Maybe not for everyone, but for me. And that's all we need. This isn't a popularity contest.