Kills by grenades/rockets don't count

The title says it all. Critters killed by grenade/rocket launchers are not on my kills list. Well, unless bashed to death by a launcher itself.

Same if you set them on fire

What about traps by the way? I can understand traps, fire etc. not being counted. But direct hit by a grenade/rocket launcher is conventional frag.

Really fire should count as a kill as well. It may not be the most sportsmanlike, but it should still count.