i believe it was to stop the terrorists gunning down the vip from miles away with an awp (as would normally happen in cs)
AND TO BALANCE THE TEAMS A LITTLE. HAVE YOU EVER PLAYED AN AS_ MAP WHERE THE CT'S ARE OWNING EVERY ROUND?
oops caps, can't be arsed to change it, even though i just typed this, which is probably longer than that, but i'm still too lazy to go back and correct my original mistake, so tough.