Abuse of power

Son and Friends stop in road 100m from our house to check speaker wire to amp just installed as it sounded like it was shorting fixed it and left. About 30 minutes they return home and stopped in the dead end circle outside my house. Suddenly 5 blue security vehicles arrive and block them in and get confrontational as the house they had stopped out earlier had a panic attack and had pressed their alarm backing the person that had pushed their button. Since when is it an offence to stop on a public road to check your vehicle and since when has blue security have the power to block in a resident that has stayed in the same house for 35 years and then be confrontational and side the person that pushed the button ? This is a total abuse of power and they do not have the right to threaten kids or treat them in this manner.