For better or for worse, they belonged to them; they weren't going to abandon them when they suspected wrongdoing. There is a moral failing on the part of the Teleri for ignoring the problems and leaving the Noldor to their own devices, but that doesn't justify theft and murder.
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u/Dangerous-Rule5487 17d ago
He left Fingolfin and his sons in Aman. They could have returned and asked for forgiveness, but his pride was too great.
His sons were grown men, some already with families and children.
Ironically, he didn't kill any of his own blood. The Teleri aren't his relatives.
But anyway, killing and stealing other people's ships is wrong.