How come the fda has not approved drugs like mms, vitamin b17 or dca for cancer?

Wishful thinking. Jg, all of us -- myself included -- want to believe disinformation campaigns offering false hope. Yes, real medicine has problems. But think -- no conspiracy could be this vast. Real science is the most cutthroat of all human activities. If mms (industrial-strength bleach to drink), "vitamin b17" (usually amygdalin) or dichloroacetate worked, a real scientist would prove it & win the nobel prize.