"I need this item so I can do more damage"
YOU ARE A GODDAMN TANK! We have a high dps Marksman, a bursty Mage, a healing support and an engage heavy fighter. YOU ARE HOLDING YOUR TEAM BACK BY NOT BEING AS TANKY AS POSSIBLE.
The fighter builds a damage item because they are a goddamn fighter and need at least some damage to make them significant enough in a teamfight.
"why so I can die last after you guys?" IF YOU ARE DYING LAST YOU HAVE FAILED YOUR JOB AS THE TANK. STOP JUMPING ON THE ENEMY ADC LIKE YOU ARE AN ASSASSIN AND PEEL FOR YOUR TEAM.
IF you are 
guess what! You aren't a pure tank and you have justifiable means to build damage but don't skip the tank items if you are the only tanky person on the team.
IF you 
You probably don't need to be building any damage outside of 
Yes there are special situations where certain damage items will be useful but if you friggin build 
on one more time I am pinning the loss on you. 
makes more sense than that shit.
I'm sorry for the rant but that shit reasoning lost me LP.
Edit: I am aware some of the first champs listed aren't really tanks but they ARE Frontline and need to be TANKY so they don't get blown up instantly while the squishies stand behind them trying to do damage.
