It's only scary to Americans (maybe reaching hard because of Trump?) and those who live off Twitter and Daily Mail headlines. For the rest us it's marginally better than when the crazies where screwing us over with Brexit.
>Arrested is not the same thing as being charged. The latter is what would lead to a trial.
Often the entire point of the arrest is to get restrictive and onerous bail conditions imposed on people. Frequently restricting their speech on social media by threat of imprisonment for violating their bail conditions.
That the charges are later dropped isn't the point.