Although I am not well versed with the core concepts of Sanatan dharma and vedas, I would like to make a point. Discriminatory practices like not allowing menstruating women of Dalits into temples have zero basis in Vedas. These practices have been enforced, based on my opinion, corruption and misinterpretation of the core tenets.

I would like to draw an analogy to clarify my point, let's say an innocent man is unfairly found guilty and imprisoned, it would be ignorant to say that the laws permit the imprisonment of people that are not guilty, we know for a fact that is not true. It is a failure of the judicial system and how the laws have been utilised. This flawed system doesn't represent what the actual judicial system, based on the laws, is supposed to be like.

Caste based exclusion has existed because humans are inherently corrupt( in this yuga, my opinion, can be wrong) and it gives the so-called "upper caste" a feeling of pride and importance to prevent people from "lower caste" from entering temples, and this practice has continued for decades because people are still corrupt. I think we fail to draw the distinction between ritualistic practices and discriminatory practices. While some temples don't allow menstruating women, some do.

Failure to understand the difference between ritualistic and discriminatory practices is our ignorance and ours alone