It's because famine experts are saying that it's likely reached the point of no return.

Starvation builds and spreads over time. It kills the old, young, and ill first. But it's not just a lack of food that kills you. At a certain point your body starts shutting down, your organs damage themselves, and just suddenly being given food and water isn't enough to reverse the process or the damage. It takes serious medical intervention.

Western governments and media are trying to register their faux-concern now, when they know it's likely already too late for most people trying to survive but before the world sees the scale of the death.

For them there's the further complication that a) actual footage of famine, never mind deliberate famine as extermination, isn't that common and hasn't been normalised in the ways that killing via warfare has to their populations and b) their very direct, very cut and dry role in defunding, banning, and smearing the likes of UNRWA are a legal liability under international law that they can't handwave away like 'defensive weapons' etc

That's incredibly bleak, I know, but that's my honest read having worked for aid groups and hearing what those people are talking about. I'm not suggesting that there is zero hope or that people give up on Gaza though. We have a moral duty as people to keep fighting for each and every person. And even if we lose that fight, to make sure the people responsible are exposed for what they are.