That can be true sometimes, like the whole “the Jedi order was corrupt” thing (the Jedi are allowed to love, according to Lucas, what’s wrong is attachments, or possessive love), but a lot of prequel defenses can also literally be things from the films and what Lucas has said. Like David-Talks-SW on Quora (who I’ve actually learned a lot from), all of his answers are from Lucas and the films. Like what I said about Anakin’s turn. There are many quotes from George, which you can even hear if you listen to the commentary, that say that Anakin was just really scared to lose Padme, it was because of his fear of loss, he had a tendency to give into his darker emotions in his personal situations, that the whole “the Jedi are evil thing” is really just him rationalizing his actions, that him becoming a Sith is intentionally framed like a pact with the devil, etc. Here’s one for example:
“You can love people, but you can’t want to possess them. They’re not yours. Accept that they have a fate. Even those you love most are going to die. You can’t do anything about that. Protect them with your lightsaber, but if they die they were going to die. There’s nothing you can do. All you can do is accept that fact.
In mythology if you go to Hades to get them back, you’re not doing it for them, you’re doing it for yourself. You’re doing it because you don’t want to give them up. You’re afraid to be without them. The key to the Dark Side is fear. You must be clean of fear, and fear of loss is the greatest fear. If you’re set up for fear of loss, you will do anything to keep that loss from happening, and you’re going to end up in the Dark Side.”
I’ll admit I’ve been wrong sometimes (like when I said Yoda changed between the prequels and the originals; he didn’t, he was just put in a no-win situation by Palpatine: https://www.quora.com/Did-Yoda-realize-what-went-wrong-with-the-Jedi-What-did-he-do-to-make-sure-his-mistakes-were-not-repeated/answer/David-Talks-SW?ch=17&oid=290173934&share=cc3d380b&srid=RmE0J&target_type=answer) but I’ve learned a lot more about the prequels and I still stand by everything I said here (and on other things like my “OT Vader is emotional” and midichlorians thread).