[Shasown]

They assaulted ships on the high seas outside of their territorial waters without legal intent, to take command without consent of the owners of said ships that makes them pirates.

They resorted to the use of lethal force in pursuit of this aim, even though they were also equipped with non lethal weapons. By using lethal force to obtain an illegal aim, that makes them murderers.

They may have been under the illusion they were operating within the law, they may have thought the activists on the vessels would simply surrender, that doesnt matter.

Same as if a burglar broke into your house armed with a knife and gun, threatened you with the knife you fought back and he then shot you dead, in the UK they would start with a murder charge.

If they had waited until the boats had actually crossed into their territory, same action same result, a lot less criticism.

The Israelis simply wanted to ensure their illegal blockade wasnt broken, full stop.

What part are you still having difficulty understanding, EL?