I generally agree, although I have some extra remarks, both for and against manuals.
-many drivers don't know how to select gears and so engine revs to get maximum acceleration of their car, which slows them down on slip roads and makes overtaking dangerous. With modern automatic all you have to do is just to floor the throttle.
- many drivers are not good at engine braking and downshifting, which wastes fuel and is dangerous at mountains. Even big ventilled brakes can overheat if a driver doesn't do engine-braking.
-many drivers are so lazy they won't learn moving their hand from steering wheel to stick shift and back, so they keep one hand on stick shift all the time. This is dangerous for they have 2 times poorer grip and strenghton the steering wheel so they can't react properly in emergency, and it's also damaging for gearboxes to put extra weight on the stick shift, for it is transfered to the cogs inside the box that don't work in the proper position
- shifting up is entirely up to the driver, so in powerful car like eg. Ford Mustang, it is safer to have manual, because it won't shift unexpectedly, increasing the skid of rear axle even more and throwing you into a wall or onto the opposite lane in less than a second.
- in case of brakes failure (very unlikely unless you don't maintain your car properly), a very skilled and cold-blooded driver can kick-down to perform extensive engine braking, even such that puts him into risk of blowing the engine or locking the powered wheels. In rear wheel drive car a driver can also do a 'shift-lock' to force the car into oversteer when it's not possible otherwise, and use this to avoid collision. These techniques are not possible with modern automatic gearboxes, for they simply won't listen if you tell them to kick down on extreme. But those are pretty extreme techniques only a few could use, and it's extremely unlikely for them to be necessary in normal driving.