What are the challenges and opportunities of politics on crime prevention?

I'm not sure what you're asking; the challenges of getting involved in politics; the challenges of getting involved in crime prevention; the opportunities for getting involved in both.
Law-abiding citizens long for a government that will do more than just control crime. They want a government that will actually put an end to it. And while comparative crime rates might suggest that some governments are more effective in crime prevention than others, the overall picture shows that human government is losing its struggle against crime. Still, it is not unrealistic or Utopian to believe that government will soon put an end to crime.