The answer to any problem lies in the answer to the question:
Cui Bono?
Whenever there's an equal number of those who benefit, and those who DON'T benefit, issues tend to stagnate.
Whenever there's an overwhelming number of people who BENEFIT and they either outnumber or hold more power than those who DON'T benefit, the issue moves forward.
It can either move forward due to down-to-the-detail planning, as conspiracists claim, or they are merely a perfect storm of events. Usually a combination of both.
So, who BENEFITS from the current influx of immigrants?
1) The immigrants themselves
2) Liberal governments - as they gain in power as the number of those dependent on government social programs increase
3) Conservative governments - They benefit indirectly, as businesses LOVE immigrants, since they are eager to work hard for cheap
4) Liberal people - As they get to "feel good" about giving something to those less fortunate (and almost always of a different color) without actually giving something of their own
5) Secondary government employees (social workers, educators, teachers etc) as a swell in low skilled, immigrant is job security
6) Unions of the above - for example, execs at teachers unions stand to benefit greatly from an increase in immigrants, as it will lead to an increase in demand for teachers
Who DOESN'T benefit?
1) Private property owners not connected to the government
2) conservatives not connected to the government
So long as THOSE WHO BENEFIT outnumber or hold more power than THOSE WHO DON'T BENEFIT, this will continue.
As far as the argument that most immigrants aren't a drain on society, that's not exactly true.
Consider that income taxes don't kick in until after a gross income of 40 or 50K, which most immigrants will NEVER earn, they will be USING government services (roads, hospitals, schools etc) without paying any taxes.
Even if they get a job as soon as they get here, stay out of jail, work hard and NEVER go on welfare, they still take more than they contribute, from a government budget standpoint.
Of course, if I were a poor Mexican or Central American or South American, you better believe I'd do everything to get the U.S. and get any kind of job. So I don't blame the immigrants in the least. They're just doing what any human would do in the same situation.
However, this will ONLY increase animosity between various groups in the states, between citizens and the government, AND make the financial health of the government worse over time.
This will CONTINUE until the U.S. is by and large a third world cesspool.
DETROIT is the future for ALL U.S. cities.
Maybe not in the next year or two, but most certainly in the next decade or two.
PREPARE YOURSELVES.