Vaccines and vaccination help to reduce risk of infection for each vaccinated person and reduce the severity of illness if you unluckily get infected, have symptoms, etc. Although, you will have bigger chance to recover, you will put you into risk of infection if you carelessly join the crowd. It is more serious if the crowd you join are mostly unvaccinated. It means you will get more exposure to the virus and have bigger chance to get infected. Exposure and infected are different. Vaccine help you to reduce infected risk. If the population you live in have good vaccination and herd immunity, you will get lower exposure.
And yet we are talking about "honor system" in the fans at the stadium and that is the biggest risk I have seen. We are talking about 10-20 even 30 thousand people all together in a compact space and we think this is okay?
I do not understand how vaccinations would make that okay right now, because we do not know they are all vaccinated but even assuming they are all vaccinated if we have just 10-20 infected people in there, there is a possibility we could leave with 50-100 infected people after the game, considering they all go to work and have families that is at least another thousand person infected in the end. Just one game, another thousand, with 2% death rate we have 20 dead people, even at better rates we have 1-2 dead people, why? Because people wanted to go to games, THAT'S PER GAME.