I'm curious for your reasoning behind this. Is this lack of knowledge outside of the movies/disney meta? Lack of knowledge about the writing behind it? Do you know shit about Star Wars instead? I'm actually curious what you mean because so many fans know so many different fragments of an almost unattainably large lore space that you sound incredibly wrong and right at the same time.
Leaving aside the Euro/Christocentric opinions on the Jedi's spiritual philosophy in regards to their "failure to stop the Sith," anyone that has even a casual understanding of the background should be aware of three things:
1: The Jedi won in the end. How are you going to complain about them not batting a perfect game when they still won?
2: Republic/Jedi history spans millennia. They kept a galactic republic composed of THOUSANDS of species functional while serving as spiritual/political/military leadership. It's all fake history obviously, but in the conceit of the universe one failure doesn't mean jack shit, they're one of the most effective and altruistic organizations in fiction.
3: They don't "kidnap kids" like half the smoothbrains on Reddit say! They're, in fact, so adverse to kidnapping and violence they won't even take a SLAVE CHILD from outside the Republic without consent! It's a major plot point!