I just have to ask, does that include the rest of us as well? Let's say someone punches me. Can I just blow his head off?
In Florida...yes, as a general matter of fact, you can!
Should you?
Well that depends on the specific situation, doesn’t it?
The severely autistic young man who obviously freaked out and hit me in my throat a few years back (when his very stupid relative/guardian took him into a crowded, loud restaurant)did not intentionally set out to assault me.
I didn’t kill him, or even call the cops to press charges.
If a criminal tries to rob or physically assault me...the results would be wildly different.
Being assaulted puts one in the “reasonably in fear for their life/well being” category and many States say it’s OK to use deadly force. Cops get a quicker ride through the process but you would likely be OK if you had to kill someone under those circumstances.