If I had an account at coinbase, my interaction with coinbase would be regulated with an agreement. The agreement, in loos terms, requires them to execute my orders.
If I give them the order to payt a scammer, why should they block this order? Maybe I am happy to be scammed, maybe I owe themy money because they lent me money before, or any other unknown reason.
Did they now officially block the orders?
At first I thought maybe they simply showed a pop up message like "You are about to send your BTC to a scammer. Do you want to continue with this".

Well, since we are in a bitcoin forum here, I strongly assume that no one considers it a good thing when their orders can simply be stopped.