>>5
But unlike those other two boards, 4chan has moderators who constantly browse it. Besides, it's not illegal from the website's standpoint to have someone post illegal content to it - it only becomes illegal when such illegal things are not promptly removed.
>>6
As far as I've seen, /b/ doesn't seem to hate paedophiles. In-fact, /b/ seems to be made up of between 5% to 10% paedophiles anyway.