Alternative Minimum Tax (AMT) is a parallel tax system that is calculated in the background as you prepare your return. If it turns out that you owe AMT for a particular tax year, then Form 6251 will be included in your return.
The AMT version of Schedule D, Depreciation, and Form 8582 are in your return because there could be some differences in those forms between the 'regular' tax and AMT. All of these forms can carryover information from one year to the next and the AMT information is needed to be carried over in case you are subject to AMT in the future.
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