I never keep anything of any value at all visible in my car no matter where it is parked. Thieves think nothing of doing hundreds of dollars worth of damage to break in to steal the smallest thing nowadays.
I think the most risk, and I see this often, is people who park in the unloading zone and haul one load of stuff to their room leaving their car unlocked, or even wide open. Opportunity makes a thief easier than anything else. Most are too darned lazy so if confronted by a bit, even a small bit, of difficulty they will look elsewhere.
Lots of folks let down their guard at DW because it has such a wonderful reputation but there will always be those who will take advantage of such. I once saw a family leave their stroller, with purses, outside a public restroom. I stood guard and warned them when they came out. I hope they listened.
SG