No, its not the parents fault. Its the fact that this is the FIRST generation to have video games at this level. Parents do not know much about games because THEY HAVE NEVER PLAYED THEM.
M, means tons of stuff. Hell, GTA 4 is rated M, and is MUCH worse than Fallout 3. Call of Duty is rated M, and is much less graphic. You my friend, must do more research!