ZIRP happened as a long-term back-channel bailout to all the banks & funds holding the downside of the housing & derivatives market collapse. It allowed the financial sector to reinflate several asset classes that should have seen steeeeeeep declines & corrections, so that they didn't have to face insolvency.
Then on the back of that there were all these knock-on effects to cheap money, or more specifically net-negative yield on things that historically were supposed to be slow, safe value stores. One of which was epic amounts of money flooding into VC and VC making the attribution error of their access to money being correlated to their access to ability & insight, but in the prevailing environment there was no correcting feedback function for that either.
So, cheap-money became dumb-money, but sociologically we attribute lots-of-money to intelligence & capability, and from that a decade of Hundreds of Billions of Dollars of trite visionless total crap was born.