Because you can't just start blowing people up. This is the first official case of a police department purposely blowing someone to bits. This is america telling citizens you will be treated as military combatants and not just shot but blown the fukk up.
Have you ever been near a bomb? I assume not.
Understand that now if your neighborhood precinct decides they can bomb areas of your neighborhood.
The military did not bomb him, the military did not even sign off on it.
A local police station decided to set off a bomb in a downtown parking structure of a metropolis city, and were able to without any red tape.
That should be concerning to you.
edit: Also, I stay in LA.
Gang members here have grenades. That is not speculation or hysteria. I have seen them. Yet, even the gang members have the restraint to not use them.
One of the major differences between 1st world and 3rd world war torn countries is whether or not you can walk the street without fear of a bomb detonation.