Why?

Yesterday we went fishing, like we do 5 days a week and this is what we returned to. We launched the boat at Prossor and went fishing, we came back a few hours later and someone had smashed my front windshield with a rock! Can you believe it? What is wrong with people? There was nothing in the car either...they didn't even get in, they just damaged the car, just because. There were a few guys up top and they said the saw someone hanging around the car and trailer, but didn't think anything of it. What happened to common courtesy and standing up for other people and looking out for one another? Are there no good, honest people any more?