Hey, come on. Jesus also said "pluck out your eye". You gonna do that? We're all blind?

The question is to UNDERSTAND through the word, what Truth the Lord is communicating.

In my view, "Judge not, lest thou be not judged" is about the type of heart you have when you encounter the sins of others. See a man committing a sin.... Curse him, or belittle him, without understanding what trials or life or tragic inheritance he has, and you end up scaring your own heart and making it smaller, smaller, smaller.

It's not about observing evil in action, and stepping back to let it do its damage. But that is exactly what Aquinas is talking about here. It's not "judgment" in the heart, but about acting justly before God.