If it were as easy as you think, our guns would have been confiscated by our government a long time ago. It's not at all "easy". Frankly, it's impossible, which is why it's never been tried.
Why is it impossible? Well, for one, our right to keep and bear arms is guaranteed in our nation's founding charter. The strong and certain sense of that right has been passed down through every generation in this country since its inception. It's now a part of our national DNA.
Secondly, gun ownership is so widespread in America that there are now an estimated 90 million (known) gun owners, possessing an estimated 270 million firearms. Any move to confiscate those weapons is going to be met with massive resistance. Most of those gun owners realize that their guns are the only things standing between them and the gulag. Once our guns are gone, we'll never get them back, and millions of patriots be murdered by their own government.
Don't think that your government hasn't war gamed this scenario out many times. The fact that they've never come for your guns should tell you that their simulations showed them losing every time.
I think you are right on target.
Of course, we will always have the weak-kneed among us.
I think this is WAY over the ‘compassionate-conservative’s’ heads...