Sadly, that's hard to dispute, esp. re cordless angle grinders. I had no idea how capable those things were until I bought one myself, and cut through a 1/8" steel plate like it was butter.
Most affordable crime-prevention devices nowadays can only stop the garden-variety thief. Stuff that really works, e.g. LoJack, requires treating your tractor like a Ferrari, and paying for a subscription GPS tracking service.
I'm a geezer who grew up where front doors weren't locked, even if folks went on vacation. All this is just tragic and heartbreaking to me.