Worst design decisions?

The US Congress.
"can you say ADA - sure you can" - Fred Rodgers

Who thought it was a good idea to put braille on the drive up atms?

--bill (sorry ren, I couldn't resist)

I'm still trying to find out the point of labeling the light switches in
airplanes. I can see the point of doing it if the button is obvious to
the touch, but on some planes they use membrane switches that aren't
obvious to the touch. I know the ADA probably requires them to label
light switches, but the logic of doing so escapes me.

While I don't know if the person in question was blind or not, I *have* seen someone use a drive-up ATM from the back seat of a car.