Given that this program is exposing them to STEM courses, I don't see how this is forcing them into STEM fields. You won't be able to find a single course in school that everyone is interested in. So given that your complaint is that 'not everyone is interested in STEM' as the reason to not teach Science Technology Engineering or Math subjects in school, if you apply that to any subject, there wouldn't be any subjects teachable in school.
Also, people who like the STE of STEM, tend to not end up in public education (Math being the possible exception), schools are filled with adults with no interest in STE (but I admit the interest in M can vary wildly). So having some extra encouragement for STE might help make the amount of STEM taught in school to match the interest in STEM that the students have.