Once upon a time, downvotes tended to stop at 0 or -1 for things that were perhaps just mistaken or misguided rather than outright mean/trolls/antisocial.
People should care a lot less about downvotes, and, votes in general. I bump up comments that were clearly downvoted to express disagreement. That's the fix to this problem, not trying to convince 1000 casual users to change the way they use the downvote button.
That's how I generally express my satisfaction with businesses, but sometimes just "never eating here again" is too generous to the restaurant that served you food with hair...
