The bit not mentioned here is the fact that the Arsenal game was a sell out - any Saints fans wanting tickets and presumably bolstering our vocal support would have been unable to buy one because some Arsenal fan had taken it (by fair means or foul)......
Had 2 Germans next to me in Block 40 who started laughing when Arsenal scored and looking longingly at the the main Arsenal fans - I asked them if they'd like to go and join them ... err no, they remained utterly passive for the rest of the game.