I’m not sure why posters need be nervous? If someone “has a go” you are not actually in the room with them ! Just read it, reply or ignore or move on !
Not everybody has the mindset to do that. They do worry, they don't like unpleasantness or confrontation because their MH is fragile.
'It's just my opinion' doesn't move a discussion on at all, and as that should never be the basis of a decision to vote for something we should know why we chose to vote the way we did, whether it is about philosophical belief or based on compromise.
They may well know exactly why they have that opinion but it doesn't mean they have to discuss it further in a chat room if they don't want to.
Recently, I was accused, shoute at even, not to politicise an issue. There were many aspects to the situation discussed, familial, social, cultural- all very important- but there was also clearly a political side too, which had altered the situation greatly. But this was just dismissed, which is not healthy at all.
Maybe they felt that they could change the non-political things more easily and didn't feel they'll be heard in politics. Whilst it may be irritating to feel you are not getting your views heard, you obviously misjudged the tone of the room. You can lead a horse to water but you can't make it drink. You are probably doing yourself a disservice to persist if people don't want to listen. It's different on the "Political" threads where people come on the discuss things but if it is advice that is needed, maybe backing off before you get shouted at is the way to go.