Because knowledge is a preventative measure to being manipulated
People also say that knowing that historical events happened don't benefit them, would you agree with that too? These things are a lot more nuanced than just what direct benefit they give you. Knowing the basics of how our world works, including how nature works, is useful.
You have no idea how many times I had to explain evolution to people because it was relevant to the conversation and where they were tricked by some weird bullshit. Gaps in knowledge are exploitable, but not only that, the more you know, the higher your capability of connecting concepts together in a sound manner is
Knowing how evolution works has been generally useful in my life, and I am very happy I know how it roughly works, and the field I'm in is nowhere near biology or chemistry or nature
However there definitively have been times that were better before they got much worse, and I'd argue that today is one of those times
On big difference today has compared to, say, 10 years ago, is that 10 years ago there was much more hope for.. well.. hope. Today? Well, things are going to get much worse before they get better, if they ever do.
There is nothing that says the future must always get better just because historically it for the most part have. Sometimes the most rational thing to do is to indeed prepare for the possibility that things will get much worse. Otherwise you end up with a situation like how people today wonder why more Jews didn't move out from pre-war germany