After realizing that we can't deport 11 million illegal aliens (because you say so...) I have decided that there are some other futile endeavors that we pursue.
We can't arrest all the drug dealers. Imagine how much it would cost to arrest and house all these people all at once. [insert lame anecdote about how many busses it would take to transport drug dealers to jail]
We can't arrest all the sex offenders. There are just too many to arrest all at once. Their crimes should be ignored. [insert anecdote about how arresting all sex offenders on the same day would would affect the labor markets... these sickos do have jobs you know]
We can't arrest all the thieves. Way too many people steal. It would be way to expensive to house all that recovered stolen merchandice while we wait for it to be claimed. Plus so many security guards would lose their jobs. [insert anecdote about the loss prevention industry being vital to our economy]
Wait a minute... I just came up with an idea! Arrest these people AS YOU CATCH THEM and don't make it easier for them to commit their crimes! That just might work!