Had the bears entered an occupied home they'd have been bucking.
They didn't, they entered what to them was essentially a cave thanks to the stupidity of the owners.
And it's not exactly like the owners didn't have any place else to live. This was obviously a second home for them and they just couldn't wait 6 more weeks to get that insurance check.
Had it been a safety issue it's a different story but it wasn't as is evidenced by them wanting the bears killed because the insurance company wouldn't go in until they were gone and as another has pointed out because they stood to make some money off of it.
Safety is one thing, this was not about safety for them.