* Wow- So FBI agents see themselves getting into hand to hand combat with who exactly, American citizens?

If you're not breaking the law, then you have nothing to worry about.

Bad guys, whether they are citizens or not will fight like hell and do anything to avoid being captured. You know, because they don't want to go to jail or prison.
The agents are learning better self defense along with better ways to take them down, so they don't get shot, stabbed, or beaten by the bad guys.