The folks over at Ubisoft already has a plan in place in order to deal with such trolls. Basically, those who decide to take the action to pick off their other team members in Rainbow Six: Siege “will not be tolerated”, and it remains to be seen just what kind of plan that Ubisoft has in mind when it comes to “handling” them.
So far, there are no penalties incurred to discourage players from teamkilling other players, but thankfully, all those incidents happened in the multiplayer beta last week, which will no longer be there at launch. Ubisoft mentioned on Twitter, “We have a plan in place to handle them.It will not be tolerated at launch!”