Defrosting Meat in the Sun

Wife laid out some frozen pre-marinated pork in the sun today. It was still in the package, she put it out at 2 p.m., retrieved it at 5 p.m., and it was in direct sun for the first two hours. 85 degree day here, no clouds.

When she brought it inside, it was warm to hot to the touch. She throws it in the fridge and says she'd be ready for me to grill it in an hour.

I threw a fit, and have always been disgusted at this practice. She says it will be fine. She's no dummy (Registered Nurse), but this drives me up the wall.

A quick google says this is an unhealthy way to thaw meat. Can someone enlighten me as to why? Should I be worried? My plan it to grill it for her and grill some Louisiana sausage for me. I'll feel terrible if she gets sick, but she's so stubborn that I'm done challenging her on this.