To me it looks like Anderson got old and had his leg injury. He then felt the need to use them to try to remain in the sport. He certainly didn't look more guilty in his prime than his opponents Belfort, Sonnen, Bonnar, Marquart, Leben, and perhaps others who all got caught while being closer to their prime than Silva.
I use to be an avid hater of fighters who were caught doing PED's. But about 50% of the best fighters in the sport have either been caught or have the look and ability that makes it seem very suspicious. Now days I just let the tests do their work and once the fighter serves their penalty, I don't hold anything against the fighter.
And lets be realistic. Do you really think being a whiny drama queen crying on here will make any difference at all? The UFC has went as far as they are going to go on the testing and penalties. Most of the people doing the whining are basically two faced. They complain about the guy who is up against their favorite fighter (example: GOAT competitors) while ignoring a majority of the others who have been caught doing PED's.