The answer to your question is pretty simple, actually; the "we" would would let SVB depositors fail are also the same "we" that compose the voters and participants in the US economy who would be harmed by letting SVB depositors lose out on their money.
Allowing people to starve and die isn't really in the best interest of the very people who would starve and die, so... "we" won't let that happen.
I'm not saying we allow them to starve and die. They can apply for SNAP, EBT, and Medicaid, just like everybody else if they become truly penniless. Get a job delivering Jimmy Johns. Or just sell their vacation homes.
Allowing people to starve and die isn't really in the best interest of the very people who would starve and die, so... "we" won't let that happen.