One instance where this happens is that I feel negative about a big influx of people from other countries and other cultures. Which is why I understand where the anti-“illegal immigrant” people are coming from.
But I know I have no right to prevent people from moving where they have a right to be. And, yes, everyone has a right to be on “public land” (unowned land) and on property where the owners give them permission to be. I don’t have a say in the matter.
And I know you can’t justify statism with statism. Or “borders” with the “welfare state”, for example. Socialism doesn’t justify intensified socialism.
I also know government “borders” are more likely to be used to hurt me than to protect me. It’s always the same with any government protection racket or any other socialist program.
That’s why, in spite of my feelings, I can’t join the anti-immigrant folks. Now, if you want to defend your private property from trespassers (of any sort), I’m on your side.