A Rewarding But Dangerous Field
One does not have to look very hard to find videos labelled "police brutality" or "excessive force from law enforcement." Also the embarrassing videos that show poorly trained LEO/Security staff getting thrown around as they fumble attempting to get control over an individual.
The reality is violence is an inevitable part of the LEO/Security work field and you need to know how to address it. The training you receive from your employer is not enough, and it's a big reason why people are losing faith in LEO/Security. You need to know how to control a person in a way that ensures your safety, as well as themselves.