Does it ever get scary when working with crimes?

Yes, it can be scary but how scary it gets also depends on what type of crime-fighter you want to be. The first step is to figure out if you want to do something like corporate investigations or law enforcement - there’s a big difference. If you want to work in a company, it’s not as scary because you’re not literally chasing bad guys, but you chase them in a different way. Being a crime-fighter is one of the most rewarding careers, just find what works best for you. And, like the previous poster said, you should always have a healthy amount of fear of crime.

It is scary sometimes.

If you are not scared sometimes, then you are probably not the type of person we would want to allow to be a police officer or someone working with crimes. Working in law enforcement is dangerous work. There are dangers, not just getting shot or hurt physically, but it can be very tough mentally and on your family.

It depends in which area you are working in. I agree with Shadi that there is a big difference between a desk job doing corporate investigations and being on the street in law enforcement. However, even working a desk job you will come across unsettling content. In all cases you need to be able to cope with the things you come across. So you need be sure you have the right mindset (and usually also a good sense of humor) when working in this field.