That is an interesting point. The statement "the company that helped save the world" that I was responding to was stated without evidence. So, in the words of Christopher Hitchens, what can be asserted without evidence can be dismissed without evidence.

IMHO, if someone disagrees with me, they can ask for evidence, and there is plenty. Downvoting makes my post less and less visible, suppressing my opinion, rather than debating it. That's why I think it is cowardly. Of course there is a place for suppression, for example for abusive posts or inciting violence. But here, I politely state my opinion, let people debate.