What he is doing isnt actually illegal, its wrong IMO but legal. He sees them "all the same" therefore dosnt know what is or isnt harmless, its perfectly legal to kill snakes to protect yourself or others. Still you would think its pretty easy to tell a carpet python from a elapid

but i guess thats easy for us to say since we have an interest in them.
IMO it makes more sense to kill(or keep if legal) a deadly snake rather than to relocate it where it dosnt belong although you may get a warm fuzzy feeling moving snakes long distances isnt a good thing at all(not directed at anyone just something to consider). Preferably they should be moved as little as possible or simply left alone whenever possible. Education is the best solution, but it can be hard when ppl dont want to be educated.
bjbk18, i would be very careful scaring brown snakes off, one day you might get more than you bargined for.