To keep the peace? What you’re saying is that the sight of Christians praying might cause the homosexuals to lose control of themselves and attack the Christians.
OK, how about just enforcing the law - in other words, if any of the homosexuals attack anyone, cart THEM off to jail. But oh, no...the cowardly cops find it much easier to abuse the people who will turn the other cheek.
You never know what could happen when you have two opposing groups. I’m sure the Christians were outnumbered and they very well could have been attacked . The job of the police is to make sure that the two opposing groups do not intermingle, thus preventing violence . It appears that the Christians did not obey the law and were arrested for it .
Keeping the peace is the goal of law enforcement whenever there is a politically oriented parade/demonstration . No matter how unpopular, or whether they agree with it or not, the police have a specific duty. I seriously doubt persecuting Christians is what the police were doing, as that vague article would have you believe .