Because that is the only reason that he would approve of his aid threatening to ban William F. Buckley from the radio because he criticized them:

Buried in this op-ed by former Bush speechwriter Matt Lattimer about Margaret Thatcher is this incredibly juicy nugget.

A few years later, when (William F.) Buckley questioned the wisdom of the Iraq war and George W. Bush’s 2008 surge, he was all but drummed out of the conservative movement. “If you had a European prime minister who experienced what we’ve experienced, it would be expected that he would retire or resign,” Buckley once said of Bush. For such apostasies, Bush aides threatened to ban Buckley from the radio airwaves. (I know because I was there.)

(emphasis mine)

These guys sound more like Stalinists every day.