There really is no need to kill at all if you don‘t want to, it will make a change not to kill sometimes. Fallout 4 has made it a bit easier to avoid doing so, by apart from the obvious of Sneaking past the enemies to get to the kill-target, there are at least two other options to use in getting the kill-target.
Still Sneaking though, kind of obviously, but there is also a weapon that is known to greatly assist in that, but it requires the ‘ammo’ to be made by the player. There also happens to be another weapon known, that will completely avoid killing in any encounter, it specifically does not kill, you will have to find this weapon though, an obscure weapon, and on first thoughts I thought “what‘s the use of that“, until I realised.
The Player now has easy option, well a more easy option, if played well and with a reasonable sneaking skill, to reduce the kill count to almost zero, by just killing the quest kill-target, but with the option of the other weapon, possibly even that kill could be avoided.
From now on, I intend to do more of that kind of play, it will take far more skill but will be better role-play and actually quite exciting. I view sneaking as being very much role-play, and very much the player doing the role-play.
I did have fun though wiping out locations, and all the loot I got from the dead, but I can still get that loot with pick-pocket if need be, and the occasional killing spree, for fun, smile. I now realise that two locations where I slaughtered everybody, I could have made just the one kill.
Yeah, I really fancy the other variation of play, it’s getting a bit too easy to sneak-snipe kill. Well done Bethesda for giving more options of play, the more I play and find out things about the game, the more I think the game is actually a masterpiece of game-play.
Edit: The second "obscure" weapon is said to 'Stun', for a period of time I guess.
Opinions.