Revenge

You could really say that about so many actions people take daily, something as small as helping someone out of a burning vehicle exposes you to massive liability in some jurisdictions for example. Oh and in this case it would probably only result in any sort of civil loss or criminal conviction if you have shown intent to seek this as a result, but otherwise you're just using a support structure for art on your property. Gonna be an uphill battle if they wanna sue. (Mandatory I am not your lawyer)