You provide zero evidence that the US stocks are overvalued (I'm not saying they aren't) so you should refrain from demanding evidence from others. Furthermore

You provide zero evidence that the US stocks are overvalued (I'm not saying they aren't) so you should refrain from demanding evidence from others. Furthermore, why do you think the FED should've raised raters earlier? Supporting the stock market is not their mandate and it is thus not directly relevant whether and how long has the current bull market lasted. A big market crash just a few years after 2008 (and 2011) would've certainly had a dampening effect on recovery so they might have felt justified in increasing the money supply. Inflation is running low, economic growth and labor markets were very weak for many years after the 2008 crash. They had pretty good reasons to be supportive.