I once had a major loyalty program make a 176,000 point error in my favor. I asked them about it and had them correct the mistake. Didn't get anything special for it, either.

So I put my miles where my mouth is when it comes to being honest and attempting to crrect mistakes.

However, I don't feel a particularly strong compunction about policing all errors that a program may make in my favor. I transferred some points from Diners Club. The miles didn't post after two weeks, so I called. The miles posted and I got a phone call back confirming this. Yesterday the miles posted again. It was just 1000 miles, transferred for the NW FFF 5 promo. I called to get my 1000 miles, and I'm not going to call about the extra 1000 miles.

But if a loyalty program wants to call me to follow up on mistaken points posting, I'd be happy to
* send a form letter response, apologizing for their flight delay
* send a request for documentation that was contained in the first message
* ask them for greater patience, and to contact me again in 6-8 weeks
* finally return the extra miles as a 'goodwill gesture'

Seriously, while I am honest in my dealings with programs and point out major mistakes in my favor I do think that it is reasonable for me to look out for my own interests -- honestly and forthrightly -- and to let the programs look out for their interests.