Has it ever occurred to some of you that some tanks and healers don't want to DPS? I'm not sure why focusing on their primary role makes someone a bad player.

Abandoning the main purpose of your role purely to put out more DPS is being a bad player. Also, someone could be an absolutely amazing black mage, but are still learning the healer role. If a tank pulls way too many mobs for the healer to handle whilst wearing a full set of STR accessories, that's the tanks fault. It's the tanks main role to take damage, not otherwise.

Nobody is saying that players shouldn't DPS, but it doesn't make someone a bad player if they don't. A lot of people play those roles because they don't enjoy DPSing in the first place. Don't get me wrong - I main a healer and DPS whenever I can, but I don't put the fight at risk of wiping because I'm focusing on something other than the job I chose.