Rohith
This totally my opinion[ as a common man not debate expert ] . I don't like or have time to write about 1000+ words , So My reason will be in a single passage.

Mal argued about children must get approval from their parents to make this decision[ all] . This doesn't satisfies or explains about his view . "First off no minor has right to anything to supercede parental/guardianship representation. Not withstanding certain legal declarations which would be irrelevant on top of that."- This is pure dictator things , What is meant by supercede ? He not mentioned which law prohibits a child from making his own decision . He failed to argue what would be the effects if a child made decisions themselves.

Pro clearly thrown a stone to Mal's card house in R1. He mentioned parents can only advise . They are not a judge or King as a human child is not parent's product , Child's have brain , life , heart. I think once a child thought to think about his own decision making he stepped first step in maturity . As con failed , Pro won.
If anybody need further reasons message or comment it. Thank you . A good debate and topic, keep it up.