I don't understand the thought process here. Like many, I don't browse Communities individually, I browse /All and sort by New.
So I am required to see something I like and upvote or else I am not allowed to an express an opinion in the community (or any tangentially linked community)?
If I see something I don't like (which is what the voting system is for), I should go to the Community it's posted in and make sure to upvote things before I downvote? That's the expected order of operations?
If not... what if, while browsing /All /New nothing randomly appears that the viewer likes enough to upvote? Is that then somehow the fault of the viewer and they should then be banned?
Am I interpreting your rulings correctly? 4 downvotes in the span of 10 months (judging by the times on those posts you listed) is a bannable offence? Seems rather heavy-handed to me.
Apple and Mac come to mind.