Gotta think about it this way.
Takes someone all of 1 second to smash a window, maybe a couple seconds to reach in and run off with whatever valuables.
So a junky with no income can spend 5 seconds and possibly make hundreds if not thousands depending on whats in the bag.
NEVER leave valuables in sight. Even on a busy street. No one would intervene. Don't be lazy, lock your stuff in the trunk.
I once left a set of sunglasses out in my ex gf's car. Parked the car to run into the store for less than 5 mins. They broke in and stole my glasses and opened the trunk to steal my gf's jacket too.
My personal car. I lock the switch for my trunk, and in come cases disconnect the inside trunk release so only can be opened by remote and/or key. I've been lucky enough to say I haven't had a single break in for 10+ years. But leave nothing in sight, like NOTHING. Lock my trunk and glove box. And have an after market alarm with paging + GPS. I've had a few incidents, but nothing got damaged or stolen. Just a hood popped open to try and disconnect my battery/alarm.
Hood pin saved me on that one.