In the USA we drive on the right side of the road. (I doubt that’s news to any reader, but I’m being thorough)
There’s a strong social tendency for folks to do other, non-automotive things on the right too. Walking on a sidewak, people generally form two streams, one going each way and each stream stays to its right. Ditto in airport terminals, train stations, etc where you have a wide concourse. A mob 40 feet wide going both ways will form into two 20 foot wide streams on the right side from their perspective.
Where there are double doors, folks generally go through the right one, reserving the other one for folks going the other way.
Presumably the legally-required driving on the right reinforces the social norm of walking on the right.
So the question is: In countries which drive on the left, do most people also walk on the left and go through the left door?
(Oh, and please, no jokes about right/left politics. I’m as appalled by our government’s recent behavior as you are.)