I think Alzheimer's absolutley could (if legit) mitigate the fault I find with Sterling's 'caught on tape' comments. We may not want to admit it but we all have biased and prejudicial thoughts. When we are of sound mind, we use our good brains to quickly filter our thoughts before words emerge from our mouths. This filtering helps us to dismiss certain thoughts as nonsense or faulty thinking (as when we draw a conclusion based on insuffient information or based solely on a stereotype), or helps us to calculate the impact our words might have on our present audience (we may feel much freer to say certain edgy things when in the company of our closest friends than with neighbors, co-workers, boss, grandmother or strangers).
Among other things, Alzheimer's (and other disorders that impact the ability to think) impacts the ability to filter thoughts. A person with Alzheimer's might be far more likely to blurt something out or to make an illogical argument because of the inability to hold together a logical train of thought or to consider the impact of his comments.
Alzheimer's wouldn't excuse his prior behavior, but would provide a relatively benign explanation for insensitive comments in lieu of a history of such comments. I guess my point is to suggest that if his punishment is only the result of (response to) his current comments (as Silver stated), I would have a hard time with the level of the punishment-- if he is actually suffering from Alzheimer's. That said, I do want to say that if the punishment is based on the totality of his behavior over the years, then I think the punishment is overdue.