Because it takes years and years to be adjudicated.
They can get EADs and as I said, what court would deport parents of USC minors.
Once the eldest USC kid is 18, join the military and get PIP.
There was an Eastern European poster on here or maybe Reddit. Did the whole asylum thing after arriving on tourist visas. Lost the whole case eventually, but not without popping out 2 USC kids. Kids turned 21 (they had immigrated to Canada) and then returned here to sponsor parents. The poster was wondering if he could visit and adjust with Canadian passport.