All steroids have the same side effect of rage or do you think there is special kind that are given to athletes that make them docile. You think there are two kinds of birth control pill so I'm not surprised of your ignorance, lol. You are the last person to discuss pharmacology.
You're wrong, you're wrong, you're wrong you're wrong you're wrong... as usual.
Professional wrestlers chronically work out and and some use steroids and occasionally kill their entire families with shotgun so nobody should underestimate the mental disconnect steroids has on the mind. The term Roid Rage originated from the irrational anger and distortion of reality it causes, it's a known fact and side effect. There is also a trend of suicides from young people using steroids which is another side effect. Incognito could be off them now but the effects of the drug could still be affecting his judgement, it's one of the few drugs that stays with you snd actually alters cognitive skills after use.
http://www.nytimes.com/2005/03/10/sports/10steroids.html
So you find one guy... wait... I'll be nice even toss a few more well known cases out there for you... Lex Lugar, Chris Benoit and Macho Man Randy Savage (all accused of roid rage) plus the too many to list who died from medical conditions associated with steroid use. Let me tell you something.. Chris Benoit had serious mental issue long before he took his first roid. Doesn't mean they don't cause rage in some... SOME, NOT ALL. It doesn't mean roid made him pick up the gun and slaughter his family. He was one of a few out of millions who took roids and snapped. To blame the drug entirely is a cop out.
And so fucking what? It proves some forms of roids cause rage or health issues when misused. That doesn't prove ALL steroids are dangerous let alone have a side effects you claim. It's just not true, you're wrong wrong wrong. I have a friend I grew up with who was a competitive body builder, later became a NY fireman and hero on 9/11 who carried a woman down 10 flights of stair in tower one. He admittedly shot roids for ten years and never showed a hint of rage or anger, still has his dick and ball sack too... cause that's another misconception that all roids shrink your dick.
It also doesn't prove Incognito did anything other than leave an inappropriate VM or suffers from any rage or somehow beat the strict NFL drug testing policy which you if you knew anything is nothing like baseballs in that...
1) The NFL has been testing for PED's since 1987 (20 years before MLB issued it's first test).
2) It's not just random testing in the NFL, you are tested constantly (twice a year) and not just urine samples either. Because of the lawsuits for head injuries the NFL now uses blood and hair samples as per their insurance regulations and tests for a variety of things so as to avoid or limit future litigation. Ie... Similar insurance regulations (blood samples) was how Magic Johnson's HIV was detected early by LA Lakers team doctors.
3) The NFL's punishment scale is harsher than MLB's (ie... first offenders are suspended and there's no three strike rule in the NFL).
4) There isn't a single secret failed test that can't be released to the public (ala A-Rod and 150 plus other MLB players) as per any Collective Bargaining Agreement like MLB has.
There is a reason why you don't read or hear about steroid issues in the NFL.. Cause there are none aside from the occasional dummy who thinks he can beat the system and fails. Certainly no wide spread use or scandals like MLB has endured the last 20 years.