Donations are completely different from voting. If you want to spend your own money, then it's up to you whether you want to take credit or not, and you're certainly entitled to do so.

Voting in this context is allocating a shared pool that only really makes sense to exist at all to the extent it is allocated efficiently to increase the value of Hive. For that you need people to be able to both upvote and downvote without harassment or retaliation.