Israel risks fuelling its conflict for another 50 years with their tactics in Gaza, former Defence Secretary Ben Wallace has warned.
Writing in the Daily Telegraph, the senior Conservative MP said Israel risked undermining the legal basis for its actions in the territory.
"If [Benjamin Netanyahu] thinks a killing rage will rectify the matter, then he is very wrong," he said.
Israel insists military pressure is needed for victory.
The intervention by Mr Wallace, who was defence secretary under three prime ministers until August, comes amid growing international pressure over the scale of civilian casualties.
Foreign Secretary Lord Cameron has called for a "sustainable ceasefire", and warned "too many civilians have been killed" in a joint article with his German counterpart.
Mr Wallace said he was not calling for a ceasefire with Hamas, but warned Israel needed to stop its "crude and indiscriminate method of attack" in the Gaza Strip.
"His methods will not solve this problem," he said.
"In fact, I believe his tactics will fuel the conflict for another 50 years. His actions are radicalising Muslim youth across the globe."
The Israel offensive, which followed the deadly 7 October attack on Israel by Hamas, has seen much of northern Gaza be flattened and 85% of the territory's 2.3 million population driven from their homes.
An estimated 240 people were taken hostage from Israel by Hamas and despite some hostages being returned during a temporary truce, about 120 people are believed to still be held in the Gaza Strip.
Israeli Prime Minister Benjamin Netanyahu has said "military pressure is necessary both for the return of hostages and for victory".
Last week, he said Israel would continue "to the end" despite international pressure.
According to the Hamas-run health ministry in Gaza more than 18,000 people have been killed since Israel launched its retaliatory campaign.
Mr Wallace said while he believed going after Hamas is legitimate, "obliterating vast swathes of Gaza" and "collective punishment and forced movement of civilians" was not.
In response to the former defence secretary's remarks, Israeli government spokesman Eylon Levy told OceanNewsUK's Today programme Mr Wallace's choice of words were "unfortunate language".
He said Israel was targeting those who carried out the 7 October attack and was putting in place "unprecedented measures to get civilians out of harms way".
"What will radicalise a new generation is if the terrorists who burned people alive, and tortured children in front of their parents, and raped Israeli women and girls, literally get away with murder," Mr Levy said.
"It [Israel] is making the mistake of losing its moral authority alongside its legal one," he added.
In his article, Mr Wallace says he thinks Mr Netanyahu feels "shame" for not foreseeing the deadly attacks - especially as "someone who presented himself as a security hawk and tough guy".
But he said a "killing rage" would not rectify that.
While he criticised Israel's response, Mr Wallace unequivocally condemned the Hamas attack, adding that they were "not interested in a two-state solution either".
A two-state solution - which is supported by the UK government and other international powers - would see Israel and the Palestinians live peacefully in separate states.
In the article Mr Wallace described lessons learnt from the Troubles in Northern Ireland, and wrote that actions such as internment "taught us that a disproportionate response by the state can serve as a terrorist organisation's best recruiting sergeant".
An opinion poll carried out between 22 November and 2 December by a respected Palestinian think-tank, the Palestinian Center for Policy and Survey Research (PSR), found that support for Hamas had more than tripled in the occupied West Bank compared to three months ago.
Supporters of Hamas were still in a minority, but 70% of the respondents said armed struggle was the best means of ending the Israeli occupation.
