You ignorant bunch of......
They were affectionately known as "Safety handles".
I used them for years.
IF... the bike's owner ( or cheif crew mechanic ) was CLEVER enough to keep the rims in true and adjust the brake calipers to their recommended clearances, the Safety handle worked a treat.
I went on the Castleton Classic in 1996 on a Peugeot Carbolite ( steel everything ). Others with Std, 'as you'd expect' brake levers were on the drops tugging at their levers while I was on the tops grasping my Safety handles DOWN Winnatts Pass toward Speedwell Cavern and Castleton Village. No problems.
They could also be used with the fingertips while riding relaxed on the upper bends.
In fact, they were excellent. I could ride on the tops very relaxed and apply the brakes by simply extending my index finger to the Safety handle without the bother of going to the hoods.
There was a bike once ( someone will remember ) that had Safety handles and the index gear shifters on the handlebars right next to the stem clamp to effect 'thumb shifters'.