that's not true.
if your car has a crooked wheel AFTER an alignment, that means "straight" is not longer the middle of the steering rack. it's off by however much the wheels is tilted (of course, assuming the wheel hasn't been removed and tilted in the past).
if you band-aid this by altering the angle of the column/wheel in relation to rack position, you will in fact have a car that will be able to "turn more" to the left or the right.
a PROPER alignment consists of locking the steering wheel level (assuming the wheel being level indicates a middle-of-the-rack condition, which it won't in nospeedlimit's car anymore). then, the steering links and rear tow adjustments are made to make the wheels parallel (or within toe specs) so that the car's "straight" also equals "middle of the rack" and thus, a "level steering wheel".
so, yes, a proper alignment will fix a crooked wheel. and, if you got a crooked wheel after an alignment, they didn't do it right, and changing the wheel/column relative to the rack isn't the answer.