Harry > Louis = Liam > Niall in my opinion. Harry is obviously the smartest but I don't understand how you think Liam is stupid, especially with the amount of input him and Louis have on the music.
Niall is the least intelligent in my opinion, I wouldn't call him 'stupid' though.
Wasn't it Liam who made the "I am totally not homophobic, but I am not gay!" tweet, then didn't understand why people were upset?
I think that is when I realized he was a bit derpy
Naïve =/= stupid. He clearly hadn't approached the issue before but honestly he was probably overwhelmed and Tyler ****ing Oakley getting his 'stans' involved didn't help.
It's not Liam's finest hour but I don't totally blame him. Hanging around homophobic people for a day or two doesn't make you homophobic. I bet the topic didn't even come up.