Banks make money through risk. Sometimes those risks work out and people make money. Sometimes those risks don't work out and banks fail. This is capitalism 101, and to the extent banks are capitalist enterprises, there's no way around it. Government's job here is just to limit the damage.
If you want banks to be perfectly safe, then you are arguing for government-chartered, not-for-profit, non-capitalist banks. These are things that exist, but we don't have them here in the US. We could, if you really want people with millions in cash to have someplace perfectly safe to park their money, you can certainly argue for their creation.
In the sense that I never said that, sure.
The only thing I claimed, even implicitly, is firing a bunch of people because their employer's cash disappeared would be bad.
That has a technical meaning in finance: https://en.wikipedia.org/wiki/Financial_contagion
https://news.ycombinator.com/item?id=35122581
I repeat: "In the sense that I never said that, sure."
In which case, since you're not claiming contagion risk, I return to my previous point that there is no reason for taxpayers to bail out rich people who took a gamble and lost.
You're the one claiming there will be contagion here. I don't think that's the case. If a bunch of unprofitable companies with bad treasury management go under, I think the rest of the economy will be fine. Companies go out of business every day.
If you are claiming that tech is somehow special such that contagion will harm the wider economy, as was the case with mortgage-backed securities in 2008, then any taxpayer-funded bailout should be a one-time deal that goes along with enough regulation so that contagion is no longer a risk in the future.