Also, unlike ~/"Library/Application Support/minecraft", that folder doesn't appear to have anything useful in it, so deleting it on every launch doesn't seem to lose anything interesting.
On MCL-4038, I listed a workaround: delete ~/"Library/Application Support/Minecraft Launcher/" and the probability of a successful launch goes up a lot. (I'd also be happy to assist with any diagnostic info.)
Also, unlike ~/"Library/Application Support/minecraft", that folder doesn't appear to have anything useful in it, so deleting it on every launch doesn't seem to lose anything interesting.