Well, in terms of ethics, the subject tends to be very.......Subjective. Take for instance; The BOR garuntees us a number of rights. Among those is the right against unlawful search and seizure. Often, the cops, knowing they can intimidate lots of people will ask people if they can "Take a look inside" your car. Now, you do it because you are intimidated, but you have waived your 4th ammendment rights by doing so. The officer knows this. Is this unethical? I personally think so. Police officers are supposed to uphold the law, but often will skirt and subvert it at every turn to make an arrest. To them? Perfectly ethical.
Most organizations have ethical standards as guidelines. Fans dont. For me, I have an ethical standard known as my "Once Cent Line". Like if I'm buying a car. Conceptually, the sales guy could keep jacking up the price of the car .01 cent at a time. Eventually, I would say "No sale". He could counter with "It's just one cent more than my last offer." To which I say "One cent too many."
That is my life ethical standard. Should Mike Vick be allowed to play in the NFL? IMO; No.
I know Mike Vick has been involved with the barbaric spectical of dogfighting. It's proven. This alone would not make me say no to re enstatement. Yes, he fought dogs. If you are just bringing the dog to fight another dog, and if one dog loses, he's put down quickly and humanely (Gunshot to head) I still find it abhorrent, but not something ban worthy.
What vick did however, demonstrating callous, unrelenting and IMO unrepentant amoral acts of cruelty towards said animals, not to mention all the dogs that he captured, or had captured and more or less fed to the other dogs.....That's over my one cent line.
Joey Porter, I'm positive, has fought dogs. I do not, however, know the extent of his involvment. I doubt I ever will. I've got no issue with him being able to play in the NFL because I don't know to what extent he is involved. He hasn't crossed my one cent line.
That's the best way I can explain individual ethics.