What if we all started at 1 upvote, as we always do, but votes cannot go below 1? So instead of having -65 votes, if 3 people liked it and 65 didn't it would cancel all the way back to one without allowing us to see precisely how many of each we got? Then we wouldn't have people participating in downvote wars and all opinions would be read without too much of a bias from the herd.
So a really bad proposal or discussion will remain neutral, but a really good discussion will get properly rewarded with upvotes to increase visibility. This system ensures that what is visible the most is possibly the most interesting, while not creating an environment of hostility for those whose ideas are not well-received.