When the enemy team has a fed Riven who is building pure damage and you are a Gangplank and a Nocturne; do you:
A - Build pure damage
Or do you:
B- Build some tank items; be it HP or Armor; to stop her instantly killing everyone and spiraling even more out of control? [Bonus points for the enemy team also having a Tristana and even a Teemo; so a Randuin's wouldn't exactly have gone amiss.]
According to the Gangplank armor is for noobs. So everyone who plays a tank or a support is a noob then.
Fun times attempting to support a team which was too dense to build a single armor item or HP item against a Riven who got fed. [Ended up with us getting Penta'ed by her. And the team still refused to buy armor/hp]