That's not a support button is a Club Member banner, you don't join a character club if you don't want that character in Brawl, sorry, but you just don't.
Of course the individual would like that character in Brawl...
I said they don't nessisarily believe that the character will actually BE in Brawl...
In fact, my entire post was about making the distinction between what characters a person would like to see in Brawl and what characters the person actually believes will be in Brawl.
I would love to see Ryu Hayabusa in Brawl, but do you think I actually believe he'll make it in the game? Very doubtful.
You were attacking a guy for supporting Roy (via support buttion) and thinking that Marth will not be in, saying asking him "how he could believe that Roy will be in and not Marth". But his support buttion, or pressence in character support club doesn't mean a thing as to who the person actually believes will be in Brawl, it just shows who a person would like to be in Brawl.
Granted, people who are in such clubs tend to be more likely to believe that the character will be in the game, and on average believe the character they support has a better shot, but that's not proof in reguards to any individual, it's just a tendancy.