From Op's excerpt: "why should’t we shoot them dead if found to be illegally staying in this country to avoid the cost of litigation since as violators of our immigration laws they do not deserve a day in Court"

How about because you shouldn't kill people if you don't want to be killed yourself? Or how about because murder is against the law?

We have a huge problem with the Chief Unitary Executive in the country not only feeling like he's above the law, but also, actually flouting the laws with apparent impunity and daring Congress or anyone else to stop him. This is now the example that some others, perhaps the unschooled and vulgar, will follow. In some ways it is like a snowball rolling down the hill, getting larger and moving faster. We are witnessing the breakdown of law and order, and where this will lead other than collapse of civilization, when so many other issues pointing in the same breakdown direction are converging in our immediate timeline, is hard to imagine.