If you mean "that was a foolish thing to do", why not just type it? I find it hard to believe that you don't have a good enough grasp of the english language to say what you mean.

It's a trivial thing to distinguish between someone's actions and the person themself. In these examples, you target the person, not the action. To go back and later qualify what you really meant is to say that you're not capable of communicating what you meant in the first place.

Again, I find that hard to believe.