In fact, you cant really call someone a criminal until they've been convicted of a crime - cue the video of the cops being called by the black store owner, punching him in the face and breaking his jaw while the white thief leaves.
https://www.theguardian.com/us-news/2020/jun/15/outrage-vide...
It is extremely hard to react with anything but EXTREME vitriol to comments like yours - police are using excessive force deliberately, and then arresting people with no cause who post videos of their crimes.
This is a technical nicety not available to a policeman in a real situation. If someone points a gun at them, that someone is a criminal, even if they are "technically" not.
Without more context, I'm guessing their parents took them to a protest and acted illegally. If so, I think that's rather poor parenting.
There doesn't seem to be a link to the full video (or any video), so take that with a grain of salt.