Actually I agree with what zolayes said that 'A racist doesnt go around shouting that they are'. If those people didn't say anything and just pushed the man at Paris metro, I despise them even more. The one saying blatantly 'we're racist, we're racist' and then pushed the man on purpose, makes me think there is something there. Is as if someone or something 'make them to do so', too far to said there is someone, the most possible thing is because alcohol reason. It is like the same case, for example if there is a president murder case. Maybe you will find some idiots, whether they are drunk or not, in front of tv coverage saying something like 'I'm the murderer, I'm the murderer, I'm the one who did it' to gain popularity or something. Therefore the investigation should take place, whether they are English, whether they are 'real' Chelsea fans, whether they are drunk, and so on.