Honestly SU doesn’t explore the moral of peace well because every Gem is slavering over him like a Diamond pre and post reveal anyway. SU assumes everyone is an overall unified hive mind that can be “redeemed” but in actuality it’s just another Diamond exerting influence on the drones. Sure it’s benign for now but because of how fast and sporadic the gems Mind’s are changed, I wouldn’t be surprised Steven was passively mind controlling them with Pink Waves to placate them.
Steven was raised in a bubble with the “worst” of humanity he ever saw was Ronaldo, Kevin, Uncle Carl, and Pre-Pink Lars. If his universe and ours merged then he’d have government agents kidnapping/experimenting on gems, private corps doing the same but worse by commercializing the gems/tech in war/media, and even worse conspiracy nuts/psychos than Ronaldo who’d hunt corrupted gems on a vendetta or even for sport. He’d get railroaded by the worst of humanity because they know he’ll never hurt them or retaliate other than crying and screaming. They’d all do pic related as a Corp villain reveals he’s been crushing gems into dust to infuse them into weapons like Incendiary Ruby dust bullets or shards of Sapphires chained together into a computer for Minority Report bullshit.