Mainly because in Dem Party controlled states the more illegals they get flooded with the more representation they ILLEGALLY get for Congress. Plus they figure that if they make the incomers dependent on the Dem Party for their endless freebies -- at the taxpayers' expense -- then their GRATEFUL legal citizen children will vote Dem Party for the rest of their lives.
11,784 murderers came in under Biden's handlers. HALF of them murdered more than once. 10% of those were children.
Yeah, why would anyone worry about that.