The only scenario where I see disabling downvotes as a good idea is when upvotes are disabled as well.
So you either:
- have only number of views (no up/down votes) so people don’t chase virtual points
- or there are both of them so that when combined they result in a fair rating.
Upvoting without downvoting doesn’t show if people like it, nor whether it is good or bad. It only shows that it reached a lot of people and is popular. And that can be achieved with views alone.








Does Slashdot have both up- and downvotes? And if both, do you give a reason for upvotes as well?