If you have a mortgage, the lender will probably require you to have homeowners insurance. The coverage amount only covers the cost to replace or rebuild the actual structure. They don’t insure the value of the land since it doesn’t burn.
Nothing ignorant about the post. The original speculation was that someone was seeking vengence because they were foreclosed upon or they are at the state where they are about to get foreclosed.
It is commonly known that many people in foreclosure destroy and deface their property before giving it to the bank. So speculating that some guy was so pissed that he said “f**k this whole neighborhood” and did something isn’t that hard to believe.