User blog comment:Tails365/A true tank's role/@comment-8267817-20140124155943

I wouldn't say that tanks don't deal damage, had a game where I took Sejuani as a support and building only tanky items was 7/0/14 by the end of laning phase.

Same with Nautilus, his shield in a way does scale offensively, the more health the shield has the longer you can put out that sweet, aoe, damage over time.

Maokai's ult does the same thing in a way, the longer he can survive inside of that area, the more damage it will deal.

Rammus's armor become his damage thanks to defensive ball curl/taunt combo, and his ult can deal surprising damage if you build an Abyssal scepter on him.

You say that you can't take them to other lanes without trolling, but I have seen an AD bruiser Alistar top that carried my whole team on his back like a hermit crab. Trolling is a matter of perspective, almost anything can work, it is up to the player to decide what will work best for each situation.