Because he, like the rest of his family, is a coward. They are cowards one and all, finger to the wind, mostly concerned with "not offending".
The utter stupidity of trying to avoid offending your opponents -- even going so far as to offend your base in the process -- cost Pappa Bush his re-election, and it will cost Baby Bushie his re-election, and it will also ensure that Jebbie never darkens the door of the White House.
They are a despicable clan of gutless wonders. Lots of big talk, but no action. All show and no go.