Some people claim that MSG is not a tenderizer at all.
That's because it isn't. It is a flavor enhancer. It tastes pretty bad by itself, but when mixed in with other flavors, it can cause those flavors to be more intense. That is really all it does.
Some people are like Slinkies - not really good for anything, but you still can't help but smile when you see one tumble down the stairs.
A gun should be a tool in the hands of a deadly weapon, not a deadly weapon in the hands of a tool.