According to a photo of the flyer that was left on the vehicles, the acts were purportedly carried out in the name of a climate activist group that is against the use of sport utility vehicles.
Nowadays, HDB flats are designed in such a way that interaction with neighbours are kept to the minimum. Once you enter your own unit and close the door, you don't give a fuck as to what goes on outside. So it's ok. Can get government payouts some more. That's why I rent out my private property and stay in a 4 room HDB flat. Act like a coolie genes Sinkies. Nothing wrong with that.