If you do destroy their drone while it is on your property what will they do, call the police?

Probably yes.

Ok maybe yes, not probably, but if they do call the police, are you going to admit to destroying their thing? Are you sure you're going to be in the clear there? Why take that risk?

Interesting point. Quick question(s):

Is it "use of force" when targeting a piece of equipment? If you park your car in my driveway, I can move it.

I may have liability, but I think I can destroy it if it is "invading" my property.

Do I not have some "height rights" at home?

I don't know, but I hope you have enough money to pay a lawyer. Personally, I would just call the police.

Who will do what? Commiserate with you over the phone. I'd get a butterfly net or a paintball gun, take the thing out, and dump it in the trash compactor. Who's going to come demanding the thing? What can they say? "When I was flying my gadget illegally in your airspace, you damaged it!" to which you reply "Lets go down to the station and work this out".

I'm pretty sure the police will come by if you call them, that's their job. There may be the chance that they're all busy dealing with more important things, but they will come, if only to come and take a police report.