I hear you. I don't do too much of that as the blogger you resteem today might be a totally different person tomorrow.

Example: I read this awesome motivational post and was just about to resteem it. I had to step out for a sec and when I returned he had a brand new post up of some of the nastiest, most hateful stuff. The "great motivator turned into "The great bigot" just like that. (snaps finger)

I was very happy not being linked to him or a part of the mess that followed.

I do agree it can be a powerful tool for a known, trusted and worthy content creator.