While a tank and healer are easily called out for their mistakes I feel that they are less likely to be kicked because of their role due to the small amount of them and people not wanting to wait for a replacement or start over.Which leads to the group just putting up with them just so they can finish the instance. On the other hand how often do you see when a DPS is kicked the phrase they are a dime a dozen pop up? Or even when the DPS is in the right but is still called out and kicked because other members don't want to anger the tank or healer. Lets face it just like how people say the good healers or tanks only run content in premade the same can be said for DPS.