i just read bible recently

1 part i really dun understand until now:


In the Gospel of John, when asked about the traitor, Jesus states: “It is the one to whom I will give this piece of bread when I have dipped it in the dish.” Then, dipping the piece of bread, he gave it to Judas, the son of Simon Iscariot.

https://en.wikipedia.org/wiki/Last_Supper#P...s'_betrayal


my question:

when asked who is the trailor, jesus said whoever i give the bread , he is traitor..he then give to judas..

so now on the table every apostle knows the traitor...yet they do nothing and just keep quiet?

to me they are: oh judas is traitor..ok continue eating...seriously?