I've been in law enforcement 22 years (23, 24? something like that). I could give you opinions based on that, but as far as the political and social conflicts you might encounter, I wouldn't begin to be able to relate to that area.
The only thing I might suggest is some questions to ask yourself -
Why police work? What is it about that type of work that appeals to you? For many people, the combinations of power, respect (sometimes), and a safe "government" job are the major factors. These may not be enough rewards to get you through the tough times and pressures (if they happen).
But (life's full of big buts, and I've got one of 'em), if you are looking at police work as something where you can be of service to people when they have a real need, where you can make a difference in someone's life - whether it be giving directions, being the first on the scene of a serious auto collision, or just making people feel a bit safer because you're nearby - these types of rewards can help you get through tough times and pressures. Knowing that you are there when people really need you, sometimes in a very serious way, can be very rewarding.
How do you think your family would feel about it? My parents weren't too thrilled when I told them I was going into law enforcement (especially my mom), but they couldn't hide the pride on their faces when they attended my police academy graduation.
It's not an easy choice. Hope some of this helps.