Nonsense. Just like with any kind of headphone or speaker, it depends on the volume you're hearing at.
Nonsense. See above.
Yes, maybe some people do. Not everyone does. as you seem to suggest. I haven't yet committed suicide over mine (which either stems from the days where I jammed with my band, without ear protection, long before ear buds even were a thing, or, rather, from inheritance - every single one of my family members suffers from tinnitus). Maybe I will commit suicide when I read stupid stuff like that a hundred times more though.
Seriously, grow some brains.