They didn't say they intended to break in, they said they looked to see if there was a way to break in. If they could see a way, then so could anyone else, which would suggest that they aren't being protected. No actual ingress needed to come to that conclusion.
Question to see if they’re not being neglected? It wouldn’t be the first financially failed museum that thinks just letting the building fall into disrepair is a cheap way of getting rid of their collection.
if the building is unguarded and full of valuable items, someone will loot it. if you're the one that loots it, you get to decide what happens to them. if you don't, someone else will
Eeeeh, I think there is a more good-faith take on the events. My personal take is that they were just trying to do the meatspace equivalent of a bug bounty, without even attempting to touch or take any items.
Kinda like how, typically, you would be incliner to file user bugs and report any vulnerabilities you find in a product you care about. Despite having zero monetary incentive to do so (more often than not).
That's my maximally charitable take, at any rate.