Since when does putting on a team's jersey suddenly make you a fan of that team?

No it doesn't. A lot of people that wear jerseys are bandwagoners. Just because you're wearing a Canucks jersey doesn't make you a fan. Many people that went downtown whether they rioted or not, aren't actually hockey fans they just went along with the crowd to have a good time, and they only bought jerseys to join in on the fun. But just to clarify, there were Canucks fans that joined the riot. They didn't start it but they joined in because they were drunk and stupid. Some could have been real fans, some could be bandwagoners like I mentioned above, probably mostly bandwagoners. However the riot was started and mostly done be people who were there only to start a riot. I believe they were from an organization that also rioted during the Olympics and G20. They brought a truck to burn, balaclavas, fuel and other stuff. They only bought jerseys in order to blend in with the fans cheering. There were also people mostly from the suburbs who came only to drink and fight. So no, just because you wear a Canucks jersey or any jersey does NOT automatically make you a fan of the team.