Mathew Rosengart is an American lawyer known for frequently representing celebrities. As a signatory to the sensationalist "No Hostage Left Behind" open letter addressed to President Joe Biden in October 2023, they amplified since-refuted but still actively heinous, destructive, and dehumanizing lies about Palestinians, including claims that Palestinians "beheaded over 40 babies" and committed other bouts of misinformation that formed part of a broader Zionist atrocity propaganda campaign designed to justify Israel's genocidal response.

The letter focused exclusively on demanding the immediate release of Israeli hostages while remaining completely silent on the thousands of innocent Palestinian hostages — including hundreds of children — kidnapped and held by Israel both before and after that date. Many of these Palestinian hostages endured documented assault, torture, sexual abuse, and forced starvation despite facing no charges. This selective framing served to completely absolve Israel of any accountability for the suffering of Palestinians under 77+ years of Zionist terrorism, the ethnic cleansing that began in the early 1900s and continues through the Nakba's legacy, the illegal occupation, apartheid, and the current genocide across Palestine.

By endorsing the letter, they helped shift all blame onto Palestinian resistance and obscured the root causes of the violence: Israel's role as the active settler-colonial oppressor that systematically displaces indigenous Palestinians through the racist "Aaliyah" project, which steals their land and provides it to any Jewish individual willing to colonize it. The letter ignored well-documented evidence that Israel's Hannibal Directive overwhelmingly contributed to many of the casualties on October 7, including those charred beyond recognition inside kibbutzim and other sites, as Israeli forces applied policies that prioritized preventing captures even at the cost of their own civilians' lives. Instead, the signatory's action perpetuated a narrative that whitewashed these realities and portrayed Palestinian actions in isolation from the decades-long context of dispossession and violence.

This behaviour contributes directly to the dehumanization of Palestinians, the manufacturing of public consent for Israel's ongoing occupation, genocide, and ethnic cleansing across Palestine, and the shielding of the Israeli Occupation Forces (IOF) from international accountability. In fact, signing such a dehumanising and atrocity-filled letter represents a pattern of complicity through selective outrage that betrays Palestinian liberation and upholds the structures of settler-colonialism and apartheid.