The stewards are told to turn a blind eye when you point out to them that the fans sitting next to you are away fans, in spite of the fact that the terms and conditions of sale are quite explicit - away supporters are not allowed to buy tickets in the home end.
The club are prioritizing profit over the safety of their own fans. It will bite them in the arse when it does really kick off because it is entirely predictable and if people are endangered by the club's incompetence/greed, many will see pound signs and sue.
The home leg against Liverpool will almost certainly kick off because unlike the Celtic match, this isn't a dead rubber, someone will win and someone will lose. It's also the case that there is a great deal of animosity between both sets of supporters.