> I can not believe this was voted down. It is simply an assertion of fact. Whether true or not, seems reasonable and most people would agree with it.

If it was voted down, I'm guessing it was because to the extent that it's a fact, it's trivially true, and there's nothing insightful about the defeatist take. It's possible to do more harm than good doing pretty much anything. And the world is littered with problems that are not "fully solvable" but that we've mitigated greatly.