NASA killed SEI themselves. In fact, Truly had his congressional liaison actively lobby against it. In addition, the people working up the cost estimate used it as an excuse to justify every single thing that NASA was working on in its hobby shops at the centers, and came up with a price tag of half a trillion dollars.
Both Congress and the Administration got sticker shock, and the program died.
That's an interesting take, considering that SEI as a program appeared in two Bush-41 budgets, an AA for Exploration was appointed and testified during budget hearings, and Truly wasn't NASA Administrator -- Goldin was. And after that was when Congress "zeroed out" the SEI budget line.
But don't let facts get in the way of your rant.