From day one of his first term, Bush was faced with Democrats who denied the very legitimacy of his election. Given the situation, I think he has done well.
Futhermore, conservatives have never managed to elect a president in modern times without the help of moderate Republicans and independents. The Goldwater bid failed miserably. Reagan got to Washington because of his appeal to “Reagan Democrats,” among others. Rather than accept reality, too many conservatives spend their time whining about Rinos and trying to alienate people who want to be their political allies. You can’t blame Bush for that.
Sorry, but it is the other way around. Conservatives have broken arms from removing the knives shoved in their backs by RINO's over the years. Just like Democrats, there are liberal Republicans just as committed to seeing conservatism fail. They would be more than happy to see the party head back into the wilderness for another 40 years so they can get busy working with their Democrat buddies to continue destroying this country.