Consume Product

It would do a LOT of things, crime is just one of many. Possibly not even the most significant ones. What's worse, a nagging wife who hates you for the rest of your life, or getting beaten up once on the street?

The latter hurts, but after days, weeks or months it's in the past. The former causes permanent misery.

The analogy refers to imported invaders being welfare leeches, accelerating the worsening of the economy, furthering inflation, higher taxes, corruption, injustice. The negative effects aren't immediate and overt, but they are soul-crushing to the entire society.