I think it is good for police officers to go to college for three reasons. First, if we are going to trust police officers to uphold society and justice, we want them to be educated. To be sure, college does not always equate to education, but it is a good place to start. Second, college equips people in social ways. When people go off to college, they meet very different people from different walks of life. This can be very important to open a person's mind, and to see things from different points of view. This development is important in a culture such as ours where diversity is central. Third, college is a place where potential police officer can test whether they really want to be police officers. They may find out that they are suited for something else, which would be great as well.
I would argue that a college education is a good thing for police officers because they have to wear so many different "hats" in the course of their work.
Police officers are not simply security guards. They have to be able to interact successfully with all sorts of people from many different walks of life. They have to be able to deal with all sorts of problems that people have. It is important for them to be able to understand all of these different people and problems.
Of course, a college education does not guarantee the ability to do these things. However, the sort of broadening of a person's horizons that comes with the college experience would be beneficial in helping a person to deal with the variety of situations and people that a police officer encounters in their profession.