I think that this case is tragic, but I'm nos sure that much about it can be extrapolated to the issue at large.
At what age do we say that someone can be assumed to know their own mind? At my time of life, I can say (and mean it) that 25 year olds are very young, but at the same time, they are fully functioning adults, who can make legally binding decisions about all sorts of things, and be expected to take the consequences of those actions. We can't reasonably say that someone has to be older to make decisions about their own lives, effectively pushing the age of majority to 30 or so.
I have a lot more sympathy for children who are encouraged to explore ideas about transitioning by teachers/parents/society - if not overtly (although the push to teach that there are 100 genders or whatever is making this more overt), by the non-questioning, knee-jerk way in which 'being in the wrong body' is accepted as the most likely reason for all sorts of distress.
When someone is told something for long enough at a young age they are more likely to believe it - after all, children have picked up on the sorts of gender stereotyping that feminists have fought against for years. Blue or pink, dolls or Tonka toys, toy kitchens or garages - that sort of thing. Preference for the sorts of toys that many of us will have seen as unisex is now being interpreted as grounds for assuming that a child would be happier if treated as the opposite sex from the one they are. I find that more worrying than one case of an adult making a terrible mistake, really. That is not to say that I don't sympathise with TullipR - of course I do. His life is ruined.
If anything good can come from this it will be that adults will see what can happen and the push back against Stonewall and all its works will gather even more momentum. Let's hope so.