Team points in ranked games

It works weird when you get killed by environment or by your own team member/kill yourself. From what I've seen, it now works like that: for killing yourself/another team member you get a point (lol) and for dying from environment your team loses no points (which can be used to avoid giving points to enemy team), imo it should be like that: for dying from environment your team loses one point, for killing your own guy the points don't change