Even if the "95%" can be supported, a few other aspects:

Look where the "95%" is alleged to occur. Not on the actual border with Mexico, but in LA. LA is like many other large cities, with gang warfare. A possible theory is that the homicides are predominantly the result of gang activity--primarily killing each other. Information in gang killings is not easy to come by--and we are not even sure how diligently the police would pursue it.

If this is so, it is obviously not indicative of illegal immigrant activity in general--since as noted earlier, most illegal immigrants would want as little contact with the law as possible--for obvious, and already discussed, reasons. Gangs are not "typical" illegal immigrants.



This is all pure speculation--but the "95%" is a totally unsupported, practically meaningless number--so at this point it deserves speculation.

We can return to it if more context--and particularly source-- is provided.