I don't think that most people blame them onc. Like others have said, almost all of us would certainly be at least tempted to do the same. (Obviously I am not speaking of the subset that are criminals coming here simply to rape, pillage, and destroy.)
The problem, again as others have noted, is with our gubmint and politicians. This has been going on for decades at this point. The "Swimmer" led an effort that resulted in great violence against our immigrations laws in the 1960s, it has gone downhill since then.
"A nation without borders is not a nation." — Ronald Reagan
In a July 3, 1984 editorial, the Wall Street Journal editorial board wrote: "If Washington still wants to 'do something' about immigration, we propose a five-word constitutional amendment: There shall be open borders.'"
And the beat goes on........ switch into glide!!