Nearly ño one on the left ever accused Bush of purposely destroying the country. The accusation we a mix of incompetent mismanagement and cynical exploitation for profit.
Really, it comes down to what you mean by "America"; my understanding of the "[president] is destroying America" crowd is that they're commenting more on destroying America's "America-ness" than actually dismantling the nation.
Right now, on the right, you have people making claims that Obama is a closet authoritarian bent on dismantling the constitution, taking away our guns, and forcing your small town to not have a nativity scene afront their courthouse this year. Turning back the clock by a decade, those sorts of claims are not very far off from the claims of people (like a rather-younger me) on the left that Bush (or, perhaps, Cheney) were intentionally using the September 11th attacks as a tool for stripping us of our constitutional freedoms. Although obviously not a majority opinion; those sorts of views were definitely not uncommon during the Bush era.
Right now, on the right, you have people making claims that Obama is a closet authoritarian bent on dismantling the constitution, taking away our guns, and forcing your small town to not have a nativity scene afront their courthouse this year. Turning back the clock by a decade, those sorts of claims are not very far off from the claims of people (like a rather-younger me) on the left that Bush (or, perhaps, Cheney) were intentionally using the September 11th attacks as a tool for stripping us of our constitutional freedoms. Although obviously not a majority opinion; those sorts of views were definitely not uncommon during the Bush era.