The allure of going faster is the deal with road ebikes. If I can go 24mph for a few miles, with a road ebike I can double or triple that distance at that speed with the same level of effort. For those that are competitive with themselves or others, that advantage is as alluring as PEDs.
There are also those that want to go 20mph, but are simply unable to without the electric assist. With it they can ride with their buds without holding them back. I just see so many advantages to a road ebike that I am willing to allow this form of "doping".
As for me, I don't want the complication or the assist, and am happy with struggling along on a standard pedal bike. When I am no longer able to go 17-18mph on my own you can bet your life that there will be a road ebike in the stable.