Political correctness affects the state, the police, education, social care, they are failing on this front.
Because we are taught to focus on the wrong thing, which you are also doing, rather than on the crime. That's down to poor management and a culture which discourages whistleblowing and the reporting of crimes.
That's the thing you need to tackle. Not prattle on about 'Muslims do this'. No rapists who use religion as a cover do this.
Change the language instead of using it poorly. Change the culture, of the institutions to work with community rather than merely attacking huge sections of the community unfairly.
We try to tackle too many problems by getting distracted and hitting out at the wrong group.
Political correctness does have a place in our society. When it is attacked, this leads to justifying racism, sexism etc.
Don't criticise liberals who see a different - but also legitimate - problem. You just create more social problems by doing so. It is not a failure of liberal principles. It is a failure of the application of those principles. You don't simply rip up those principles because its being poorly applied. Especially where the alternative is even worse and usually even more poorly applied.
You have to create an environment where you look at the issues side by side and say 'bad person bad' and a culture where victims are not treated poorly.