The attackers may or may not have been Roma fans. They were however looking to attack English football fans as that gains them notoriety, let’s just call them cowards.
If the Marseilles story is true then I understand the Bus company's reticence to supply the buses, but this has a lotto ugly potential. In the confines of the station it really only needs a handful of people to create a potentially dangerous situation.
Given what happened in Rome I am surprised...