User blog comment:Lancer1289/Are People in Multiplayer Lacking in Intelligence?/@comment-1978336-20120730005728/@comment-3325589-20120730134715

Going to the drop-off area can actually be pretty useful on delivery missions, so don't feel too bad about it. While enemies don't generally camp the drop-off area (as players probably would if the positions were reversed) there are often a few of them hanging around or in transit through the area. These enemies can make things really annoying; even if the path to the drop-off was fairly clear, a protracted firefight at the end is the last thing the player lugging the item around wants. Hanging around the drop-off also ensures that enemies won't spawn there, which can make a big difference on some maps (e.g. Firebase White).

Also, what Diyartifact said: whatever you want to get out of ME3 multiplayer, most other people play matches to win. I consider myself a pretty good and conscientious player, and I steal kills all the time. On the other hand, I have no objection to people doing the same to me, so long as it makes the enemies die more quickly (hence my objection to people killing combo-able targets: waiting a second or two for a detonator power to come off cooldown actually results in much more damage to surrounding enemies).