Sounds like you are confusing an algorithmic stablecoin with a fully backed stablecoin. If I am mistaken and you have an actual argument behind that smirk, then please go ahead and present your argument.

GP's last paragraph seems to imply to me too that trust is all that keeps the pegs. I think the billions of dollars in arbitrage opportunity is a bit more powerful than trust as we've seen a few days ago when USDT lost its peg, but what do I know

Trust keeps bank runs away, arbitrage keeps the peg tight (feeding into said trust).