Maybe that girl is in Gan Eden, but the boy who made a mistake is ruined for the rest of his life and might be in Jail.
The girls family will forever be scared because of her death and ALL her classmates went to the funeral (her friend lived a few doors away from me) and they will be scarred for life.
Every year especially around Purim time more than a few Bochrim drink and drive and get into a serious accident.
Just look at Kiddush in Shul on Shabbos, Watch the Liqour table see how many teens take from it and see how many take more than a shot of hard liquor. Probably alot more than text.
Again I am not trying to minimize texting, but if a Rov has 30 mins to give a mussar shmooze to a bunch of teens , It would be alot better to give it on the evils of teenage recklessness like drinking or driving recklessly. even though its not exactly in the torah as opposed to the texting speech which seems “easier”