Maybe early Alzheimer’s or some other degenerative neurological condition that causes disinhibition and/or intellectual deterioration. Some drugs make people flaky, too. It certainly sounds like he has cracked.
Yep... He has always been rather unconventional and he has said some things that could be regarded as controversial, but for him to attack SEALs like that doesn’t add up. Something has definitely happened to his mental state in recent years.