At the end of the day, communities are set up by individual, or groups of members and they can create whatever rules or regulations they wish to apply. If you don't like the rules then don't join the the community or set up your own!
As for downvotes, its would be polite in my opinion to give a reason for a downvote BUT not cast in stone rule that you have to to.
Liberty also runs to you posting an opinion post like this AND your ability to vote for and unvote a witness.
This is a non-issue, but respect should be shown to everyone here and gratitude should be cast upon people who give us this blockchain and all its toys to play with whether we have the same opinions as them or not.