I don't downvote posts with bad information. I reply or send a /msg to the author.
in reply to Re: Reasons for downvoting
in thread Reasons for downvoting
I think this is an excellent way to go, because it gives the author the chance to correct the information (certain types of root nodes notwithstanding). For me, anyway, chances are more likely than not that I've found the "reply" link while short a few days of sleep, or something. I appreciate being given the opportunity to correct such nodes.
Me spell chucker work grate. Knead grandma chicken.