It isn't, though. The word raze comes from the French, raser (shave) where the word raise comes from old Norse ræran (to rear). Both have been in use with separate meanings since middle English (1100s) and here is an example of the usage with Z from 1669:
Earths..which the..salt in the water razeth off from several rocks.
~W. Simpson, Hydrologia Chymica 361
You're saying that social media is not the real cause of the youth mental health crisis? Do you propose a different cause? Because I know of a good few, very well-qualified people (of varying ages) that might explicitly disagree with you...