>>725035NTA but:
1) If you have an area where people have to spend mental resources fending off assailants, sexual or otherwise, work done in that area is far less efficient. It is ethical, not moral, to prohibit people in an area where work is done from committing acts of assault against each other so they can focus on things other than self-defense.
2) temporary detainment of an assailant can prevent streaks of offenses and allow diagnosis of the issue that led to the assault, and put preventative measures in place going forward.