Who has disproven it? It may have been "discredited" by some, but the theory itself has yet to be disproven and even if you observe the life history paradigm it borrows many elements directly from those hypothesized in r/k selection theory. You seem happy to discredit Rushton's report based on speculative reasoning, however you seem hesitant to do the same regarding your own sources. From what I can gather you're implying that my arguments are grounded in cognitive dissonance, which seems hypocritical considering your own approach.
Here is JF Gariepy, a reputable biologist, peaking about it.