Doesn't the property owner have insurance and why don't they use that insurance to clean up the mess?

Many of the property owners don't have insurance, and there is no state law which requires them to have that. However, even those who do have insurance have often taken the insurance proceeds and simply walked away from the property instead of spending any of their insurance proceeds on cleaning up the site. They do this more in Berlin because property values in Berlin have been so low that pocketing the insurance proceeds and walking away is more profitable to the owner than spending $30,000 on the clean up of a property which may only be worth $5 - 10,000 after the clean up.