British dual nationality IDF soldiers can be made accountable for their violations of Human Rights. Fear of accountability is a strong deterrence.
Remove their freedom to kill.

If they are not prosecuted, International Law will be violated and  the genocide and displacement of Palestinians continues relentlessly.

Immediate action will empower other countries to also put a  brake on the genocide.

Here is a most important prelude to peace.
We can say stop.
Hold still. 
Look at the devastation.
Stay with the arrest.
Let safety arrive.