It drives me crazy! I immigrated legally, went through the hoops, took 20 years to get my citizenship... I despise illegal/cheating aliens!
I also despise illegal/cheating aliens but unfortunately do to manipulations of our Constitution the Mexican dentist did nothing illegal. If you can get the expecting mom onto US soil and have her deliver the baby here (often at our expense) the kid is automatically rewarded with citizenship. We are the only county in the world to allow this.