Well, if there were universally balanced laws and enforcement, that would be fine. But there isn't.

The purpose of the laws (that weren't passed, by the way) is to regulate who comes in and what kind of work they do, not to keep out rapists, etc.

The problem they are not addressing is that we don't make legal immigration easy or even possible for those who really want or need to come to America. Mexico gets about 3000 slots per year. There are 18,000,000 people in Mexico City alone. We have a huge, long, and undefendable border with Mexico. Applying for visas is expensive, but so are the fees people pay to be smuggled across. If there were a reasonable chance of entry legally, we would all be better off, but there isn't.