will only respond to the owner or parents nervousness
I never said they'd ONLY respond to the owner, I think they'll catch on anyone's nervousness but I remember my baby boy checking my reaction when he didn't know what to think of sitting in a bus or a plane for the first time, and when he saw I was OK with it he just settled.
On the other hand, his younger brother was climbing everywhere and jumping before he could even walk properly and I had to pace myself because my heart would skip at watching him but he only fell when I tried to stop him. He had full control of his body and never hurt himself, so I learned to trust him..
This is just my own anecdote, but my parents were never nervous or concerned about situations they put me into.
I had the opposite experience, with a mom always thinking the worst would happen, and me feeling she was overreacting. But of course, your father didn't consider how putting you in this situation would feel for you. You don't take a nervous 6 year old in a roller coaster without them wanting to... Was it his way to try and toughen you up?
I remember my 8 year old sister wanting to be a big girl and insisting on taking a round on those like we just had. We heard her yelling the whole round.. She never asked again