Why shouldn't explosives grant kills? Did the user not purchase the explosive to kill them?
Also, I feel that explosions from the Artillery Cannon should grant kills, I mean, sure, it's annoying, but why not?
Also, with the new Bounty Hunter system - it's somewhat redundant. What prevents people from just having their friends kill them and split the cash? It seems somewhat repetitive and gets rid of the "Bounty Hunting" aspect of the system.