It's dangerous because your tires loose the contact patch when your car bobs up and down, and in certain situations can cause you to loose control.

The reason I said you'd need multiple alignments is because you should always get an alignment when you change something on your suspension, ESPECIALLY the ride height, because excessive toe out is more dangerous then riding on blown shocks, but I said twice because once after you install the springs, then once after you realize it sucks and install performance shocks.

Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician