Thanks for attracting attention, we collect feedback if it's constructive enough.
Go easy with that and please don't post any insults. It's forbidden by our Forum Rules.
Sometimes it happens (even with me), collisions or even teamdamage due to lack of attention. But the automatic system is designed to only warn players about the wrong behavior.
Only a large number of violations (afk/teamdamage) can lead to a restriction to play in other types except co-op for a number of battles. Pink is a warning, not a punishment. Yes, a small number of XP is taken away right in the battle with violation, but it's done so to make players more attentive.
So far, we have no plans to remove the chance to damage allies, and it looks very strange in battle in most situations.