The oversimplified explanation: they are stupid/unwise/shallow. I couldn't have said it better myself than your last sentence, that's exactly the narrative purpose of the prequel Jedi order.

They have the correct words memorized, but they don't understand what it actually means. Anakin is able to quote "unconditional love is encouraged, it is just attachment that is forbidden". When he goes to Yoda after having nightmares of the future, he tells Anakin that he must learn to let go of the thing he is afraid to lose, since it is just a part of life. Is any of that wrong? Not particularly, but was Yoda unconditionally loving him? Or did he uncaringly spout dogma at him when he could clearly tell he was struggling. No questions of what it was about, no follow up, no kind words, no empathy, no nothing.

Then there's the clouding of the Force. So, they could generally see the future before this point, and now they can't. And they don't think this is odd or concerning? They're not on their toes enough to expect a trap or a plot twist? Mace floats the idea of telling the senate in episode 3, many years after it started. Just because they are the ones that presuppose they are always trying to do the right thing doesn't mean that they will always have the answers, always be strong, or even not just fooling themselves into thinking they have an honest heart for the truth. Pretending otherwise led to the downfall of the free world.

Yoda can rattle off "fear leads to anger, anger leads to hate, hate leads to suffering" in Episode 1, but that's exactly what happened to them. They feared losing to the Dark Side, feared losing their influence on the Republic, so they integrated further with the government, making both weaker (which always happens when you mix religion and government), which caused Anakin to doubt because they were so transparent, then completely abandon the ideology because he saw no place for himself in the world after making a single mistake.

I am all too familiar with the mindset as someone who was raised very Christian. Jesus himself even criticizes the practice of "tithing the mint and cumin, but ignoring thr weightier matters of the law: justice, mercy, and faithfulness." Basically. the religious leaders of the time took the old law's command to give a tithe (one tenth) of your income to God SO seriously that they'd dump out every slice on their spice rack into a table once a week, and carefully divide it into 10 equal pieces, and give a tenth to God. Yet they completely missed the point of religion, the concepts and real people that actually matter. Even for the small things, why did God want them to tithe their belongings? Not because he came down and grabbed it from the altar every night, but so it could go to people who needed it but couldn't afford it. Yet the religious leaders neglected the orphans and widows in the community. The religious leaders wee "so good" by being "so dedicated" to thr tithing command, but guess whose job it was to distribute the tithes to the needy? Guess who actually kept it. They were too enthralled with the specifics (and their own additional dogma) that when God himself came, they killed him because they didn't recognize his teachings as the same thing they "followed". Whether you believe in the Bible or not, it is a universal truth about humanity, and unfortunately even so-called Christians have learned nothing from this.

Similar to Anakin, I left my local church of over a decade because my mom got cancer, and nobody said a thing about it to me. Nobody reached out after I left either. I called out one guy on it later, and he was basically like "yeah but she'll go to heaven so no big deal right? I don't know what you want me to say" Like yeah maybe, even if I fully believe that (which I'm not sure I do anymore) or in Buddhism where we all become a part of something greater, I still have emotions and it would sure be great if anyone cared enough to help me process them. If God gave us emotions, it was for a purpose, not to ignore them.