When will people realise that appeasement doesn't work? Just look at Iran. With their leaders threatening to nuke Israel off the map, denying the holocaust and saying they will share their nuclear technology with anyone and everyone, you'd have to think it would be wise to not encourage them. But, here we are again. Iran is looking at a western proposal and going to suggest changes. What this really means is that Iran is going to try and get as much out of the rest of the world as possible based on the threat of gaining nuclear technology. They will then proceed to continue with their work on nuclear technology in secret and give the UN inspectors the run around.
Appeasement doesn't stop people, it only encourages them to ask for more.