I'm not counting on it staying that way, but that's ok. Upvote systems, dedicated channels, etc, will always promote a type of groupthink but you can always opt out of a community. Like if Lemmy gets it's own r/conservative, or something, I would likely not comment there.
That said, there are definitely malicious actors at play on most mainstream platforms, stoking anger and divisiveness. Even proof that fake news is spread for that exact reason. You won't see that here for a while but if it does come, I'm not sure if this system is setup to protect against it.