Mate, our players have been physically attacked on numberous occasions on the park, not just had a couple of cans chucked at a bus they were sitting on.
Whilst you cannot condone idiots throwing items at busses, what can the club do to stop it? It’s away from the ground and so there is only so much they can do. They can issue statements and remove tickets from culprits but otherwise idiots will still be idiots.
I don’t recall anyone (Scottish press aside) screaming for us to be kicked out of Europe when the opposition team bus was attacked in Spain (Villarreal or Osasuna?) and its window broken.