Calvin, I think you are missing the point here entirely.
I am a naturalized American. Before my parents emigrated to the U.S. in 1952 they had to have a sponsor.
When my fathers foot hit the pavement the first day we entered the U.S. [ Legally I might add ] he not only had a place to live but a job.
In all the years of his life that remained he never received welfare, free hospitalization, unemployment, food stamps or any other government subsidy.
He attempted to give back to this country in the form of paying taxes whatever he could to the country that gave him so much. He didn't demand it, he worked for it.

I don't think the posts that you refer to are just about Mexicans but all those that come to this country illegally and tax the system.
You might not have figured this out, but it's your tax dollars that pay for it.

I would love for you to get your paycheck paid to you in cash in the form of one dollar bills. I would then like to see you stand there hold out your hand and have each illegal in your neighborhood walk by and take just one buck off the top of the pile.
I wonder how long it would be then until you stopped defending those that come here to take advantage of the system and not return anything to it.
What other country on this earth puts up with this crap?