Even not supporting or shunning Pakistan after no longer living there would be w good starting point. I am not saying that Yas can do this but all those British Pakistani cricket fans don't seem to realise that while they are outside of the country they can start change that perhaps they could not from within the country...
It's the general attitude of apathy that is most galling from allegedly intelligent people who say they know what the problem is but attack those who suggest that something should be done about it..
Edit I shielded an Asian looking girl in McDonald's from some deaf guy who was throwing out some language and apologised to her on our behalf on the way out of the store...it was one small thing but no one likes to be treated like a Christian would be in Pakistan.
It's perfectly possible to have affection for one's place of origin and support a sports team whilst denouncing the actions of a repressive or violent government. We don't bang up Scots for the rhetoric of the SNP (a bit of harmless humour here chaps, the SNP are not violent or repressive), as a for instance, or force them to abandon their beliefs and identity at the border because of actions of a few Twitter trolls and an occasional sectarian thug. We don't close down every Catholic church in the land and rewrite the Bible every time a priest abuses a child either. It's important to point out that in those cases, removed from our social and media bias, we seem to be capable of nuance. Why single out ordinary Muslims, and make extremists their sole problem?
Apathy in Western societies is generated in a way few minorities can be expected to resolve on their own, even if they recognise a path towards stamping out extremist which hi-jacks cultural elements and re-purposes them for violent ends. As individuals or volunteer and charity sector organisations they have neither the political clout nor resources, though they do what they can via parliamentary lobbying, expert evidence and other collaboration; just like anyone else in their situation would be, be it the UK or elsewhere in Europe. Local politics vary and can make things tougher, as one might end up in a situation where you're damned if you do and damned if you don't.
As for public apologies and social attitudes (which do drift towards Western standard over time, btw; but as our political greats indicate said standards might actually not be that far apart in their conservatism, if that's a particular issue for some) for certain actions, shows of compassion and solidarity, I agree those are nice gestures but such expressions cannot be forced and are down to the individual. A British Muslim is not responsible for the actions of an ISIS nutter, and as highlighted in these threads time and time again they oppose their violence. Most are affected by the same struggles and daily and systematic problems we are. And, yes, humans have the capacity to err and fail. Doesn't mean we should immediately hunker down, draw up the bridge and forget about our own liberal principles, or begin shedding human rights, privacy and rule of law left, right and centre. It'll lead to worse problems down the line.