No, it is perfectly acceptable to ban the most extreme members. Just because they don't ban everyone with extreme views doesn't mean they need to keep all of them.
I am tired of these all-or-nothing discussions that seem commonplace nowadays. The world is not as brightly defined as you think it is. We can make forward progress progressively.
Because they're white, because they're allied with the West or what?
Political bigotry at its finest. Either you tell ALL the radicals to fuck off or none at all.