I would not say ignore them completely. Just recently, I got some photo hints that provided me with several photos of my second and third great grandparents. It would have been a shame it ignore that! Yes, most tree hints may be a waste of time but when you hit a gem, isn't it worth it? I think so.
I agree with "ignoring" them in that there is no sense in getting worked up over something you can't change - something which is not yours anyway. Some people seem to think they have some kind of ownership of their ancestors and take it personally when there are errors about them. But these are public documents were working with here - it's really not your concern if someone attaches them incorrectly to a tree which you do not manage. I try to only concern myself with MY tree, not other people's. If they have something that turns out to be an accurate documents, great! But otherwise, I stopped worrying about other trees a long time ago. Waste of time.