It may be difficult to parse what happened as an outsider, but for those who work in or near finance it is clear that Sam engaged in wildly unethical and illegal behaviour.
At a minimum, Sam played a reckless game with customer deposits and gambled with money that was never his. At the worst, Sam had suffered massive losses in his hedge fund and tried to use FTX deposits to survive (creating a form of Ponzi scheme). At the moment it appears a mix of the two of is true. It’s horrific fraud either way.
The hole he has dug is very, very deep (billions of dollars deep) and a redemption arc is not forthcoming.
Sequoia has different incentives than EA. By design investments have limited liability, and “companies should be leveraged and hold a linear utility curve” is a dominant concept in finance. FTX unethically using customer deposits would’ve broadly aligned with Sequoia’s interests so long as Sequoia retained the ability to distance themselves from legal and reputational damage.
Sequoia was incentivized to engage in a degree of wilful ignorance, and I would suspect they did so.