[prydey]

I wasn't thinking anything extreme like the examples given, nor would I ever resort to violence myself.

I just find it frustrating that these groups can't get shut down, even though they are trespassing and damaging property and could even cause serious injury if the owner of the vehicle wasn't aware their tyres had been deflated.

Yet if the property owner decided to take action it's a fair chance they'd become the offending party. Mostly with swift action from authorities.

People take matters in to their own hands because the laws seem to protect the wrong people.