Any stupid reason would do:
I am a Swede and had to find a team to follow along when I was around 10 or so. I thought Joe Montana was an indescribably cool name, a hero QB, and his videogame for the Sega Genesis system was what really opened up my eyes to the sport. It helped that the 9ers were a great team as well. Now I stick with them even though they are truly horrible. They won't stay that way forever. They can't. Please.
However,if I was in your situation today I'd go with Green Bay Packers too for the reasons mentioned above.