Should people comment the reason for their downvote due to some people will do it just to try to reduce the reputation of others as sort of ¨Keying a car¨ and those others have to try to build their reputation back up while other people just downvote for seemingly Random and Unnecessary reasons?
This has been discussed before countless times on Meta Stack Exchange:
- Why isn't providing feedback mandatory on downvotes, and why are ideas suggesting such negatively received?
- Encouraging people to explain downvotes
Such a policy would not be enforceable and it doesn't solve the problem.