Charlie's dead, whose fault?

Here are a few things i want to make them all clear you guys. All are my opinions, no offend, no hate, just opinions, but don't you dare deny my theories.
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CHARLIE'S DEATH IS SAM FAULT. BUT NOT ALL HIS FAULT.
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- First, We all see Charlie didn't want to put Dean in the dark when she heard about Sam's plan. 100% sure she did warn him ipthat would never end well. But Sam keep convince her to go with him. You know the feeling when you really hate to do something but you still knock because you don't want to refuse and disappoint the ones you care about? That was how Charlie felt! She didn't want to say no even when she wanted. Sam and Dean were like brpthers to her and what will a little sister say when one of these brothers needing help and the other asking for help? Of course, she would NEVER say no. I have mo idea if Sam ever planned about it, but seriously, you have eyes and you all see that Sam somehow used their relationship to convince Charlie to agree woth him.
- Second, Cas also warned him about the risk they might take. What did Sam say? "For Dean." Once again, he used the relationship to convince both Cas and Charlie to help him. He knew so well they always love Dean and no way they would say no. He already knew the danger of the plan he's making. People warned him, he denied them all. I took it like it was his frustration. He thought he have no other choice so he had to take every risk to stop the mark. But honestly, he should learn something from his old experiences. Doing things behing Dean's back never bring anything good. He's already done that times ago. He should be the one who knows best.
- Third, i wonder, did Sam know about how danger the book of damn is? He chose to keep the book, lied to Dean and even Charlie at first. Charlie was so impressed and worried when she knew the book hasn't beem destroyed. Sam MUST know that. It just likes he was tp blind of trying to save Deam so he just forgot everything else. And also, working with Rowena the most evil witch bla bla bla like he introdiced her is also dangerous. Asking Cas being a babysitter may not a good choice because Cas is so... naive... But Rowena is so... evil. At least, he should know that.
- Forth, now talk about why it wasn't all his fault. People are right about this point. Sam is not the only one who is blamed for Charlie's death.
     * A, it's Charlie fault. She was being messed up with her head, she was so stressed, she was afraid of failing Dean, bla bla bla. But, she just made a bad choice. She denied Sam and Cas warnings and left the place tp the hotel alone... It's her fault, or we call it the fault on the writers who just wrote a strong smart woman like Charlie, did something stupid and carelessly like that.
     * B, it's Cas fault. He was trusted by Sam to be the babysitter while Sam went with Dean. He just too forcused at Rowena so he didn't notice that Charlie had left alone. It was his fault that he failed his mission. He failed Charlie at the last minutes.
     * C, the other to blame, that's Rowena. Just a simple question, if she hadn't fucked up with Charlie's head, would her choose to left to place at first? Rowena to be blamed cause she was the reason Charlie wanted to go out of that place alone.
     * D, blame this to the Frankenstein families. They were the ones who killed her.
     * E, we all know, it's Deam' fault. Since the begining, all the things they had done just for Dean, only one reason: Save Dean Winchester from turning into a demom again. He should never take that mark at the begining. He definately knew, again, take that mark with him and things would never end well. But he just took a risk. He was frustraded, just like Sam. That was the only way he found to kill Abaddon.
     * F, if we blame Dean, blame Crowley too. Crowley pushed Dean into the Abaddon's stuffs, while he shouldn't be there.
     * G, and blame Cain. Owner of the mark of fucking Cain. Head of the story.
     * H, if we blame Cain bacause of the mark, let's also blame... GOD KNOW WHO ELSE????
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So like i told you bellow. Charlie's death wasn't all Sam fault, but the most parts, it's his fault. I hate how people keepip saying Charlie was to blame for her own death because she didn't listen to Sam bla bla bla... Don't you think Sam should be another one needs tl be blamed because of the "i don't listen to you" stuffs? Beside, i also hate how people keep making the point that kt wasn't Sam fault. Guys! It was HIS FAULT! If we blame anyone, blame him first. It like he's already owned 9 parts of fault in the pie chart of Charlie's heartbreaking death. I love Sam, seriously, no hating here! But you guys is making me annoyed by deny all Sam's fault! Those are pointless!