[Chrislong]

Nah, your theory is back to front. If your wheels are straight there is less stability and grip, if the tyres are pointing in - driving towards each other, stability is increased.

Take it to the extreme and run toe out, if you imagine when turning right, the two wheels on the left will be both trying to turn the car. To that extreme it almost feels like driving a car with rear wheel steering.

So running toe in on the rear means the two left wheels when turning right, are both pointing in, and so even if it slips a little - it won't feel like its slipping til it slips a lot. it generates more grip and doesn't spin the rear out, but can make the front push.