If you don't use a condom no matter what age you are and get an STD - same thing - that's on you too.
Your argument about post-conception options - I agree that not everyone has the same access. But I'm not talking about that.
Condoms work. Teenagers know the risk. They're just being dumb and it's on them.
Now - your argument that making birth control more available - sure I think that's a good thing too. But the notion that "the vast majority of teenage mothers in the United States do not choose to get pregnant" is irresponsible because almost all of them got pregnant by being wreckless while viable options are readily available. Specifically condoms.
(The comment I just replied to was edited extensively after I replied to it. That's OK; I said what I wanted to say.)