More seriously, while I deleted my Reddit account, I haven’t tried to avoid landing on some Reddit threads linked from Lemmy, and for the past few days I’ve looked closer at comment sections, because I’m noticing I had forgotten how rotten they were compared to here. So much pointless aggressivity.
I think it’s credible that if Lemmy was to keep growing, that issue will also keep growing as you have noticed. So, a bit like op, I’m hoping it only grows big enough to keep the open source projects interested and staffed; but not so much so that most of the sucky aggressivity stays on Reddit or elsewhere permanently.