Have you pissed anyone off over the past few months?
Loveable Bellend, piss people off , never 

Not in my car or people in my neighborhood no. Always turn the radio off when parking etc.
Could slightly understand the Golf as I used to come in at 2am and it was loud. But haven't used it in months.
And here by you own admission could be why. You did perhaps annoy people in the golf, they have seen it parked up, and thought you now have noH interest in it thus haven't targeted it.
The other cars however are being washed and used ( micra for example, nice and shiney ) so they are now venting so to speak.
All that said, someone related to you family must have pissed someone off. Cos continued damage on a Sunday is a tad strange.