Depends on who are we speaking of. For Turin and Maeglin it certainly was deadly.
And don't forget Turin and Tuor were cousins. I believe that while Lalaith and Huor were still alive, Tuor visited Dor-Lomin, at least once. And at the pools of Ivrin he witnessed Turin declare his love for Finduilas.
I believe it wasn't Maeglin's treason that made Tuor move in for the kill. It was memory of Turin + sight of Maeglin grabbing Idril + Eol's dying words that made Tuor do it. He thought that if he had to die...
"Better from my hand than from Morgoth's" was what Tuor thought at that moment. I gurantee it.
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Tuor: Yeah, it was me who broke [Morleg's] arm. With a wrench. Specifically, this wrench.
I am suffering from Maeglinomaniacal Maeglinophilia.
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