I don't think they understand how bitcoins work. Literally not worth it to steal a Bitcoin ATM. they prob think they can get the funds out somehow
My guess is this was stupidity.
I bet they thought there were actual physical bitcoins that could be taken out of the machine.
They heard about the price increase of bitcoin and said:
"yo bro, lets go to the store that has dat bitcorn atm and take da shiz, crack it open, and be rollin in da bitcorns".