Why on Earth should Bush care if he gets impeached? Even if he thought it possible.

What actual difference would it make to his life? Congress has no power to impose criminal penalties on impeached officials.

At present it appears that Bush is destined to be regarded as wonderful by a minority of Americans, and detested by a majority. How would impeachment change this in any significant way?
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"It strikes me" is an alternative to "in my opinion". As such, of course, in strict logic, it is redundant, since writing something generally implies that it is our opinion. But it's a pleasant enough convention, adding those kind of touches.