The Problems of Pro-Trespassing Libertarians
Today we live in a society with an ever large and growing Leviathan State. So much of private property is being stipulated to government control and dictation. Instead of people having the natural freedom to discriminate in any way, government forces people to be with those that they do not wish to be with (by various non-discrimination laws). Government produces forced integration. When someone must be forced to be with someone they do not wish to be, predictably resentment and conflict will result.
Government's existence depends on being a giant mega-parasite. It cannot live any other way. Its food does not come about through voluntary transactions, but by outright (involuntary) theft. To grow it needs more hosts that it can attach itself to. In the eyes of the government, to be healthy it needs a larger number of hosts. The greater the number of hosts the better. This is exactly why the state likes open borders! Any self-respecting libertarian should pause and reflect on this. A pretty good bet is that when government likes something, whatever that may be, then it is virtually assured that it is something that people should not like! It is the reason why this issue has gone almost unnoticed until recent years. Government has stood silent.
Citizens have gotten angry. Arizona past Prop 200 in 2004. It denies illegal immigrants access to voting and welfare. The support Prop 200 was overwhelming. But practically every single politician was against Prop 200. While a vast majority of the residents of Arizona opposed illegals having the "right" to vote and receive welfare, the politicians were only too happy to have illegals both voting and receiving welfare. Should that be a surprise? No. Democracy is all to happy to expand itself to illegals. It wants more hosts. (And because the government is democratic it also needs to expand its open entry system.) The only reason now some politicians are talking about this issue is because the public has felt the effects of immigrants they do not want to be around. There is no other reason.
For government to expand it also needs to break down and isolate the individual. Government needs to own the roads and large amounts of land. In order for it to tax someone it needs access to him. This results in "government's" property in bordering all privately owned property. This lowers people's ability to keep away people they do not wish to associate with. Once people are encircled with government from all sides, anyone can walk right into your property. This includes foreigners. Instead of being able to set up barriers to prevent unwanteds, government almost completely destroys the ability for people to do this.