Why not actually enforce immigration laws that already exist? "Illegal alien" is now an offensive term--despite that they all made a choice when they could have entered legally. And we have to take them all, and favor them instead of our own--it's the law. (And no, the United Tyranny of Stupidity is not alone in this--all of Europe, Canada, and Australia also have these laws.)
That might put a dent in this problem. In order to legally move into a country, one should learn the language. You want to move into California? And yet you insist on speaking nothing but Spanish, not even trying to learn English? And you want your children speaking Spanish? No wonder one can learn written Spanish just working at or around a grocery store. Just reading some of the labels is enough to be able to recognize Spanish words in writing to A1 level--and that is not even near the Mexican border. Cinco de Mayo? Suppose I call it Fünften Mai? It is the same day--the 5th of May--why is it a national holiday outside Mexico?
And the drugs. How much filth do we have because people are too stupid to clean up--and most of the culprits regularly use alcohol to excess or recreational drugs. I understand recreational weed is now legal in California (and several other states). More drugs, more problems. They need to reinstate laws against recreational drugs, and confiscate and destroy the drugs. Less drugs on the street means less stupid, and perhaps more respect for the area. Quality of place improves, and so does quality of life (when one doesn't have to deal with piles of filth of any kind, both improve).
And while we are at removing recreational drugs from the street, why not try nutritional measures? Something like 90% of us don't get the 400 mg of magnesium that is officially recommended, and most of us are hard pressed to get enough boron or iodine. Yet, fluoride is in your tap water (I do not believe the lie that they reduced it to 0.7 ppm--it is still 1.2 ppm, and will always be 1.2 ppm). That has to go--the optimal level of fluoride in your diet is zero. For cavities (and that includes those in the brain as well as in the teeth), 1.2 ppm of boron would be far better. We also need drastically less MSG and zero aspartame in our food (neotame, also).
Most important, those who are here illegally need to be deported. They could have chosen to come legally, yet they chose not to. The street messes are the least of our problems when they start driving wages and working conditions down, rents up, and crime (such as burglary and vandalism, and robbery and violence) up. And, the message that "If you come here illegally, you WILL be deported and banned from this country" needs to be spread to those trying to enter illegally. No excuses, no sob stories. You can come here legally if you wish to, but no sob story or excuse for subverting the country.