This has nothing to do with Bush specifically - virtually no policies linked to 9/11 were reversed since the end of Bush presidency, and some actually became worse (e.g. TSA). 9/11 raised the level of public concern with terrorist threats (real or imagined) so pretty much anybody would follow the pass of the least resistance and do roughly the same. Doing otherwise would require extraordinary vision and extraordinary power of persuasion to sell it, which none of the current politicians possesses.
