I'm going to take this further.
I don't think a great percentage of cis people want minors to have access to trans medical care because this would erase visible identifying qualities between trans and cis people in adulthood.
I think bigoted cis people WANT to have as many avenues possible to identify who we are so that they can inflict as much harm as the can on the fly whenever and wherever they meet us.
This links in with their opposition to ID having our correct, amended sex/gender.