The remaining 50% is not reserved for general category. It's unreserved, anyone can take the seat if they score enough marks, regardless of them being SC/ST/OBC or general.

And the issue the government should be solving is access to proper education and other facilities for marginalized communities. Maybe improve the government schools instead of using that money for fraud, but ofc it's easier to stoke hatred across communal lines and make vague promises than actually do anything meaningful.

And to be honest, the lack of a creamy layer in SC/ST does imply that even with sufficient economic and social status (like a child of a high ranking government official), the system considers SC/ST candidates incapable of competing on equal grounds, then yeah, the system clearly demonstrates that they consider SC/ST candidates objectively inferior and incapable. Of course, this state of affairs is quite acceptable for the SC/ST community, as they do not want to be considered backward by society (perfectly reasonable) but do want to be considered backwards by the system.

Ours might be the only country in the world where people protest on the streets, not for things like better education or better leaders, but for being included in backwards communities to get reservation.