To add to Damon's post, when you lower the car, more than camber is affected. The geometry is designed to change camber and toe as the car rolls from side to side, so lowering can impact both camber and toe (sometimes even caster depending on how the geometry is set up, and McPherson suspensions can be affected in all three ways).
There's a lot that goes into engineering suspension, and you can't just change ride height and expect everything to be OK, especially if you are a performance oriented driver. Autocross and road race both have specialized alignment requirements, even drag racing can benefit from a custom alignment.
There are entire volumes devoted to suspension optimization for motorsports. I've read a few of them, and it is a combination of art and science. It's not simple at all.