If the entire US market is overheated because too much capital is chasing too few investment opportunities, which is the likely cause, then trying to cram that

If the entire US market is overheated because too much capital is chasing too few investment opportunities, which is the likely cause, then trying to cram that money into an even smaller set of investments is obviously not going to help matters. It'll sure help line the pockets of the people running the active investment funds though.