Fundamental Rights, Fundamental Duties and Directive Principles of State Policy — Social Science STD 9 — Question

As per the Fundamental Duty of citizens of India, citizens should try to protect and preserve the public property.
S.T. bus is a part of public property, which provides the facility of transportation to the public.
Pelting stones on S.T. buses is harm to the public property and hence, one must not do so.