If you mean "we" as in the Tarnished, we only killed him to stop his 'DYNASTYYY' from being formed. If you mean "we" as in the Elden Ring playerbase, Mohg was just playing the game of trying to become Lord (same thing the player does), there's nothing inherently wrong with what we thought he did at the time, since... When compared to what everyone else in the lands between did, kidnapping 1 dude and killing a few Tarnished (via the Bloody Fingers) is not exactly a massive sin.
Rarity: *3 Memoria Type: Active Ability: HP Restore [III] & MP Restore [I] on Self (cooldown 9 turns) Max Limit Break Ability: HP Restore [IV] & MP Restore [I] on Self (cooldown 8 turns) Description (JP): ็ งใใคใใๆฅๅทฎใใใ้ใใฆใใกใใฃใจไผๆฉ ใใฎๆใฐใใใฏๆตฎใ่ผชใใกใจใใกใใฃใจใๅฅใใใฆ ้ใใซๅนใๆใใ้ขจใๆใใชใใใใใฃใใใจใใๆ้ใๅณใใ โฆใใ่ฆใฆ๏ผใใใชใซๅคงใใชๅ ฅ้้ฒใๅบใใฃใฆใใ๏ผ Description (ENG): Taking a short break from the blazing rays of sun Leaving aside the swimming ring just this time As I peacefully watch at the waves washing over the beach, I relish in this restful moment ...Ah, look! There's a giant cloud spreading out in the sky! Note: Unique to Tamaki Iroha (Swimsuit Ver.)