Because Terry, prior to Tesla and for most of the early years of Tesla the technology and infrastructure were not there for EV's.
It was the same for ICE for over a 100 years against Horse and Buggy. Farmers and other could make fuel and even carry it around and yet the ICE vehicle made almost zero advancements against the Horse and Buggy which dominated the market until advances and infrastructure made the ICE vehicle cheaper, more accessible and convenient due to gas stations and roads advancements.
Just as ICE numbers went in a straight line up and to the right paralleling those advancements we now see the same exact up and to the right adoption of EV's world wide as their advancements are now finally happening.
And that is undeniable.