You aren't at fault. People are too quick to blame the stress of tanking on 'Jump-the-gun' DPS alone. Another potent source of frustrated anger are other tanks. You're gonna meet some real moron meatshields in full parties, that's just a fact of life, like sunrise in the east, and tomatoes in marinara. My tanking style is to keep calm and carry on; So I adapt and get the job done. But there's been more than a few times where I wished I could punch my co-tank through his monitor.