Hey, welcome. Best advice I would say about stopping it turning into the polar opposite would be just be the change/behavior you want to see. With the userbase still relatively small in comparison to reddit the best thing you can do it just take part in the friendly/honest discussion and either ignore or challenge the posts that are just people pushing their view point.

You do see people who are clearly just posting shit they can't post on reddit anymore which is inevitable and not always a bad thing but there are also plenty of people just looking for civil conversation who aren't tied up in narratives. It's as you said, you make your own home.