Poorly explained, but yes. Some negative camber gives the car better grip in turns, that's why alot of BMW has pretty noticeable negative camber on the rear wheels.
SOME negative camber actually increases tire grip when racing. But I know op is talking about a new slammed blista.
Also on alot of cars the negative camber increases as you lower it.
Also poorly explained but yeah, negative camber (top of the wheels pointing inwards) increases grip in turns. Basically increases the amount of tire contact to the ground when the car is cornering.
Slamming a car (lowering it too much, adding way too much, negative camber) completely destroys a cars handling and increases tire wear. Stretching the tire sidewalls (usually installing tires too small for the rim and overinflating it) is dangerous. And stupid.
Lol did I hurt a feeling?
The increased camber when lowering can be fixed with aftermarket adjustable camber and toe arms, suddenly you dont have so bad handling and uneven tire wear. You're just left with getting stuck on everything lol. Alot of racecars are pretty low, but without alot of negative camber.
About stretching, it depends on how crazy you go. A little stretch is not dangerous.
And while it may be stupid to some, it does have a purpose for those who do it. And that is to be able to fit wheels in under the fender without them rubbing against eachother which ruins both the tire and the paint.
But of course there is a limit. Too much and it is indeed dangerous and stupid.