Some people downvote because they simply didn't like / disagree with an opinion. In my opinion, a bad reason to downvote. Others downvote (like myself, but no

Some people downvote because they simply didn't like / disagree with an opinion. In my opinion, a bad reason to downvote. Others downvote (like myself, but not in your case) because something doesn't contribute well, harms, or is noise in the conversation. It happens all the time that the former group will do their thing. That's to be expected, really, on an pseudo-anonymous public forum. People sometimes feel like they're voting on opinions and positions within a debate.