They have so much power that one (or both) of the tires loses grip and sends the car in an unpredictable direction.
This is worse on cars like Mustangs that have solid rear axles (as opposed to independent suspensions), one tire going over a bump or something affects the other tire.
You prevent this by having bigger and “stickier” tires that have more grip, as well as warming your tires. If you watch videos of drag racing you’ll usually see them burning out on purpose, this is to warm the tires.
There are also tire warmers used pre-race in some racing applications, literally electric blankets for your tires.
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