Okay, I don't like trolls but, I'll answer it one time.
You are so sure of yourself. Most of the time is a good thing. When it is to judge a whole work (VN game) on a subject so light as: is riding a bicycle, with someone on the handlebar, is doable or realistic is something else.
I grew up in the 80's and yes we did that. Not often, because obviously it is not very stable and easy to do, BUT we did it multiple times and we knew how to ride a bicycle. And none of our passenger finished in the hospital or very few.

(as you can see I don't take myself too seriously right here so do the same and chill out)
I don't say the the following photos are example to follow. I AGREE with you it is not the safest way to ride a bicycle !!
So to reply to you, IMO: This game is awesome and this scene didn't bother me a bit... It even reminds me some cherish memories of my youth.
Have a good one and yes, do as I do: Ride one my friend, be constructive and spread love instead of hate.