Can anyone tell me why these 12-25mn people don’t matter as much
They absolutely do, and there have been protests in this country. I believe there was one at the Chinese embassy earlier this month if memory serves. There's people pushing for our government to do more but the governments response tends to be that discussions are taking place behind closed doors which makes it hard to establish what, if anything, is being done. There are people campaigning for more to be done, Rahima Mahmut who is on that podcast is very prominent figure among them.
I think there's a couple of things that lead to you reading about it less. Firstly the government here have declared it a genocide in parliament, something they refuse to do with Gaza which is a cause for a lot of online discourse.
Secondly there's a lot of very graphic footage that comes out of Gaza despite Israel's attempts to stop reporting, China have been far more successful in stopping reporting and sadly for a lot of people its a case of out of sight, out of mind.
There's also I think a case of fatigue. There is so many horrific things going on in the world that people can be overwhelmed. When that happens people gravitate to the cause they believe they have the greatest chance of being able to effect change.