PSA: You are allowed to go defensive builds even when you're a damage champion
If you are a Katarina mid and you're getting shit on by an Akali, get a goddamn Banshees or Zhonyas instead of gunblade. (Yes I edited it since apparently you guys don't like Abyssal)
If you are a Yasuo top and getting shit on by a Riven, feel free to go Tabis and Dorian's shield instead of rushing PD.
If you are a Jhin ADC and the midlander keeps blowing you up, you're allowed to go hexdrinker!
if you are a Vi jungle, and you died your first three ganks, You do not need to build warrior and triforce.
If you are a Brand support and Thresh keeps CCing you to oblivion, Merc treads instead of Sorc boots are probably a good idea
For the love of god PLEASE PLEASE PLEASE build some goddamn defensive items! You don't need to rush your damage every game! Better to scale later and remain relevant than get stomped with no hope of recovery.

can be defensive if you shoot enough people with it