The problem is that you didn't even understand the logic of the arguments here.
Nope, you've misconstrued what they've said. They're saying that SPV users rely on someone to give them a correct copy of the blockchain because SPV clients are not checking the history to validate if what they've received is correct. The theoretical double spend wouldn't be in the actual blockchain that everyone else can see, it would be in the fraudulent copy being given to the SPV user. Read what achow101 said again:
No,
that is cryptographically impossible. You cannot give a "fraudulent copy of the block chain headers" to an SPV user, if that user knows the currently actual block chain headers, in exactly the same way full nodes do.
That isn't what he said, and you know it.
dinofelis, your only discernible input on this forum is misrepresenting facts in a (kind of) subtle way. Well, you're also good at avoiding direct debunking of the things you say which aren't true.
You ought really to be banned, as it's too obvious that you're not interested in any kind of constructive debate, and never have been (unfortunately, dinofelis is likely the owner of many accounts that have been created with a suspiciously similar style of debate, only adding to the perception that the owner is very intent on wasting everyone's time on Bitcointalk.org)