New idea I've just come up with, we make it so, before upvoting or downvoting something, you have to press a button, and then wait at least a minute, or, better yet, solve a captcha, and then you don't even have to have accounts anymore and that takes about a minute. The only people upvoting or downvoting will be those who are really reflecting on what it is that they're doing, or the people who are really really committed and pissed off about something. I'm sure the latter won't happen like, ever.