I would have agreed with you but look at what is happening in some Asian countries right now. Imagine a situation where the thugs knock on your door with their guns. I will probably never own guns but there is an argument to make.
When those thugs show up at your door with all of the weapons drawn and at the ready, what do you think you and your little hand gun or even riffle are going to do? Wound the first person at the door before you get lit up? To what purpose?
How about: "I don't want the Trump administration to be the only ones with tanks in this country."
Are you going to buy some tanks? How about F35s?