>> In fact, if the 2008 bank bail-out, auto industry bail-out, the Silicon Valley bank prop-up, and other such actions by the US government are considered [2], if this turns out to be a bubble it will be taxpayers who end up fronting the bill.

Haven’t all three examples you note (2008 crash, auto bailout, and SV prop up) resulted in a net return/gain for the taxpayer?