Because Republican leaning pollsters flooded the averages with shit polls to create a narrative of 'red wave', every one of the Republican pollsters were horribly wrong about the results.
You were quoting these trash polls as having some sort of a predictive value while simultaneously blaming Silver for including such trash polls in his model.
Data For Progress which leans left actually came out with polls confirming the right-wingers at Trafalgar/Insider Advantage on Monday. We saw the GOP exceed even the high expectations in FL, but they underperformed elsewhere. Clearly, WA and NH were never actually in play.