Sure, we can build more jails, hire more judges and prosecuting attorneys....just as long as you're willing to pay for it. There is no such thing as a low cost criminal justice system.
The cost of incarcerating an inmate is now over $100.000 per year. Not only do you have to feed clothe and house them but you have to provide for their healthcare needs including prescriptions such as insulin for diabetics, statins for hypertension and heart disease, hepatitis any number of afflictions that require care that the inmate is entitled to as well as access to mental health services. Inmates are entitled by law to access to healthcare services.
You know the old saying...."talk is cheap"...operating a prison isn't and will likely become even more expensive in the future.
You could get a more rigorous prosecution if you want it and if you are willing to pay for it. The first place you'll have to start will be a substantial increase in staffing levels and more importantly an even larger increase in salaries in order to attract qualified candidates.
As the saying goes...."show me the money". and that's exactly what the system is telling those who are demanding a more aggressive stance toward criminal apprehension and prosecution.