I am still moderately suspicious of Karla and it's not because of the role block thing, which we've settled.
However, his attitude after ryan's vote was pretty interesting. On one hand he said, "I don't respond to most people who are suspicious of me, only when they proceed to make a terrible post." No one in this game considers ryan to be a strong player, and we all know that, and he was the only one who had voted for Karla at this point.
What appears to happen to Karla, though, is possibly... panic? When I read Karla's subsequent posts, it looks like he put far too much effort into reacting to a vote from someone who no one took seriously at the time (this was before ryan role claimed). It reminds me of how others have acted in the past, and I think even I've done it. Normally, it's nothing to panic about because the accuser probably won't gain support for the vote. But if you know that person is right, sure they may have made a lucky guess, but it makes you feel uneasy and overreact to it.