When the tank option appears (sometimes it does, sometimes it doesn't) it's a glitch.

Honest players don't take the tank at that point, but dirty players take the tank and use it to bomb the hangers or carrier. Either way, unless you're a noob you know that a tank shouldn't be available at those areas, thus you shouldn't take advantage of the glitch.

There are some games where it's not a glitch, Dogfight, and Capture the Flag. With that said, it's NEVER ok to spawnkill which is the one true bannable offense ... which you willingly did to Zebra even though you knew it wasn't right to do.