Responding as I saw I was tagged. I saw someone commenting "we don't hear much from Israel" - Israel has a very lively media, but I think that many people on here forget (since a couple of English-language sources are available) that very little of it is translated into English.
As someone on the political left, I don't know anyone who is in favour of the law. Here are a few comments from Hebrew-language public posts on social media:
From a religious leftist: "The law of death to terrorists is the final death of the State. Blessed be the true judge. Ripping clothes." (the last two parts refer to the traditional responses to hearing of the death of a close relative).
From a centrist religious Zionist who did a lot of reserve duty "Ben Gvir never served in the army and never had to face the taking of life. So he remains a criminal, racist hilltop youth just how he was, but now wearing a suit. ... The law of a death penalty for terrorists is an expression of the lust for death and killing of people who are brainwashed with hatred for Arabs, who didn't serve in the army and didn't serve their country. Once upon a time religious Zionism spewed out Kahana and people like him ... Now these sickos are the face of religious Zionism, and we have to spew them out again".
A rabbi on the left of centre: "I oppose the death penalty with every fibre of my being. I feel that our government has completely lost it. From theft [the government] is now moving on to bloodshed. How careful the historical sages were not to put a person to death. In the Mishnah, in tractate Makkot, it is said in the name of Rabbi Elazar ben Azarya ... that a Sanhedrin [religious Supreme Court] which executes one person in seventy years is called a destructive Sanhedrin. ... Only God can decide to take a human life."
Clearly the law was designed to be slipped in on a day when it wouldn't get much media attention as everyone is preoccupied (2 days before Passover during a war - a bit like the equivalent of a UK law passing on Dec 23 during a severe Covid wave). I seriously hope that one of the first priorities of the next government will be removing this law.