I think it's just a matter of respect. I don't care how much something is worth --you don't go and wreck stuff that doesn't belong to you!

vandalism /ˈvændlˌɪzəm/
noun
deliberately mischievous or malicious destruction or damage of property.
wilful or ignorant destruction
And of course, the Classical definition (from Roman times)...
ruthless destruction or spoiling of anything beautiful or venerable.