Each one has a different opinion about that. I did not know the "like" button from xenforo and did not know that it is mandatory to use it for that. But you should not ignore, that in 99% of all other forums, the posting "+1" is normal behaviour to support a former posting/idea. Everywhere on the internet.
So you can try to educate now the internet or you can accept that the rest of the world is behaving like this
But still, no matter how you think about it, a moderator is not allowed to delete postings and ban a user without double checking, what he did in all his postings and not ony in the mod-suggestion forums