Lehman failed because of the 2008 crisis; its failure did not cause or precipitate it. Even Wikipedia lays it out in the opening summary (emphasis mine):
> “A liquidity crisis spread to global institutions by mid-2007 and climaxed with the bankruptcy of Lehman Brothers in September 2008…”
Letting Lehamn fail was the right call, because it allowed the Fed to bulldoze TARP through and save the wider economy as a result. If anything, I would say the subsequent bailouts were too generous in letting the companies retain controls and returns; the government should’ve kept a permanent, partially-nationalized control of those shares and added them to a sovereign wealth fund instead of selling them back on the market. “You fucked up so bad the entire system almost failed, so clearly you cannot be trusted to self-govern” should’ve been the unambiguous messaging from the Fed.
Late to the game, but I have to call out your shameless cherry picking. That elipsis in your wikipedia quote skips: "which triggered a stock market crash and bank runs in several countries." I mean, dude...
Yes, obviously, the subprime crisis was long in the making and has deep root causes. But the bank runs of 2008 and the frozen global financial system were 100% preventable, as they were a confidence shock (not a fundamentals thing) stemming from the sudden uncertainty due to Lehman.
A little assistance from the Bush administration in 2008 would have very plausibly produced a much softer landing and required a lot fewer bailouts overall. This really isn't controversial.
"Let them fail" is almost always the worst thing to do.