This is the 100th anniversary of the start of WW1: perhaps a fitting time for our collective stupidity to rear its head again.
Many people alive today have never experienced the Cold War, and so have no memory of this fear. John McCain has no such excuse.
That's even before any consideration of whether Putin or Obama (or McCain) is more untrustworthy.
Update: Maybe someone can correct me on this, but my recollection is it took longer for the US to confirm that the USS Vincennes had shot down Iran Air Flight 655 than it took the US to declare that a missile downed Malaysia Airlines MH17. But that's due to improved technology, right?