Real simple answer: Because you are not in charge of the Israel navy. I'm sure if you were in charge, all their ships would tow a decoy behind them....hmmm.. perhaps not, since it would slow the ships down considerably.
Oh well, what do I know, I'm not an Admiral....
LOL
I thought about commenting on that one but decided not to.
I guess it was the ex-USAF in me that decided it was better to keep the mouth shut, as opposed to opening it and removing all doubt.
I can see it now, "Helm, emergency port, NOW!"
clunk...screech...bang.
"Uhhh..sir, the tow cable is now an integral part of the propellers."
giggle.