Team killing is more pointless then it is cheating. If it is someone doing it intentional just boot them. The more they get booted the more chances they have to get a quit ban. I have read but not sure if it was confirmed but being booted qualifies a person
to be banned via the quit ban. Just remember accidents happen.
"I thought Bungie was serious about this kind of stuff? Cheating, Hacking, modding, etc."
With all due respect, just deal with it. Teamkilling is not cheating, hacking OR modding, so Bungie are not a bunch of hypocrites, they do what they do where it's necessary and they're fulfilling the obligation they gave themselves.
Do well, get hit harder apparently.
Lastly, it's online gaming. If you've been around for any length of time, you should know it's not a pleasant place to be, and getting teamkilled is hardly the most offensive thing someone could do. Hate to say it but if that annoys you so much you want
to report people, you'll not only be doing it for a hell of a long time, you've also got very little to look forward to because it gets a whole lot worse.