I agree that something needs to be done OP and increasing violence is a worry. Your suggestion of a curfew isn't the answer - it would be unhelpful and divisive, cause resentment, and increase the risk especially with DV. However I'm guessing you posted the thread because you're scared, which I understand especially if you perhaps live in an area with high crime, and although it's not the answer the issues and solutions do need to be tackled.
I don't think everyone thinks about the far reaching consequences, indirect as well as direct, of failing or insufficient public services and poverty. Society breaks down, crime including violence goes up, communities are less cohesive and less safe.
There's been false economy approach for too long. Violence needs to be tackled holistically and not on the cheap (it saves money longer term for anyone thinking it's unaffordable, because crime costs society heavily including financially).
With DV, there's lots of threads on MN highlighting some of the needs. More social housing, more refuge spaces, for example.
With VAWG (and violent crime in general) public services are often threadbare, poorly funded and with poorly trained or overwhelmed staff, just papering over cracks instead of providing timely and effective help. This includes social services, mental health services and the NHS in general, substance issue services, probation services, CJS and police, punitive benefits system, youth and mentoring services, and a lack of job, education and training opportunities.