I'd argue that the UX for up/downvoting is already correct. Vote up if you agree, down if you disagree. It's intuitive and how most people use those buttons.
You can attack this problem from a different angle: Factor the number of reports/flags into the karma calculation and unweight downvoting itself. The report button on Reddit is essentially a "this content is inappropriate" button - why not use it as a part of the scoring system?
You can attack this problem from a different angle: Factor the number of reports/flags into the karma calculation and unweight downvoting itself. The report button on Reddit is essentially a "this content is inappropriate" button - why not use it as a part of the scoring system?