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I don't think you know what happened. At least one case was a person standing quietly outside on a public sidewalk while not impeding traffic or people walking.
At best you can say it is loitering.
Isabel Vaughan-Spruce is the campaign director of 40 Days for Life Birmingham, which organises prayer vigils near abortion clinics, and a leader of March for Life UK.
She wasn't just "standing and praying". There's significant context.
Second, if it was a legitimate arrest why was she was paid out by the government for a settlement?
Also, this has happened to multiple people who haven't organized prayer vigils in the past, not that it would matter if they had.