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Depends on how you choose to play.
Some people decide to stay lvl-3 combat forever and only train the non-combat skills.
Not possible to 100% complete the game that way ofc, due to how the game is designed with separate combat skills, but people still consider it to be a legit way to play, with a pretty big and thriving lvl 3 community.
It's kinda like adding an extra level of challenge on top of the thing, as you can't kill anything but virtually everything could kill you.
At least in RS3 it should be possible to play the game without ever hurting anything if you skip the tutorial.
Otherwise, you have to at least kill some sort of evil necromancer-witch-whatever before you could go full pacifist.
Also think you have to catch some fish.
Tho these days, it's possible to train combat on combat training dummies, meaning it's possible to raise your fighting skills without actually hurting anyone.
Dunno if you can skip the tutorial in OSRS, but in that one you have to catch some shrimp, kill a caged giant rat, and a caged chicken. Canned hunting, in other words.
smh or whatever it is people say these days. Shame, shame.
OSRS also doesn't have those training dummies, so in that one you're kinda forced to kill stuff if you also want to raise your combat skills.
As for me, I kill stuff occasionally, but usually only if said stuff attacked me first.
(Tho I have hunted and fished for creatures regardless of wether it's been safe for them or not throughout the years. But I'm fairly certain that my safe hunting vastly outnumbers my non-safe one, due to me mostly hunting salamanders and chinchompas in the past, both of which are caught alive. Got no defence for all the fish I've caught.)
I don't care as much about the combat aspects of the game as I do about the lore/questing and skilling.
It's just a means to an end, so I can meet the requirements for quests.