Othello Act IV: Chalk full of symbolism and miscommunication!

"What noise is this?—Not dead? Not yet quite dead?

I that am cruel am yet merciful,

I would not have thee linger in thy pain.

So, so." Othello IV.ii.100

In Act IV there is quite a lot of deceit and confusion going around. For one Desdemona can't seem to figure out why her husband who just three acts ago thought she was an angel now thinks she is a lying whore. Then there's Cassio who is wondering why he is suddenly so hated by Othello. Othello is the most confused of all even though he supposedly has the most knowledge of what's going on. He is torn between a hatred for his wife who he believes is cheating on him, and yet still gets angry when he thinks Cassio is speaking ill of her. To me, this indicates that more than anything Othello is hurt by the idea that his love is ruined. Yes, of course he is angry, but if he was really so angry he would have just slashed Cassio and Desdemona's throats when he first heard of their affairs. Instead he is constantly searching for proof of their scandal, even though Iago is providing plenty of it. I believe this is because he desperately does not want to believe this is true. His epileptic episode is a symbol of the war in his mind fighting between whether or not he is more angry or heart broken. Finally there is Iago who has somehow manipulated all the characters throughout the whole play. He has managed to keep his hands clean while ruining everyone's lives. What's most impressive though is that no one has suspected him. Well except for Roderigo but he's too stupid to do anything about it. All his accusations are simply a foreshadow to a bigger reveal of Iago's horrible deeds. The saddest part is if all these characters had just talked to each other about what was going on, they could have found out that this whole situation is a lie created by Iago, and then they could have killed him and all problems would be solved. Instead they hide in cellars listening to parts of conversations and walk around baffled by what's happened. If any of the characters had enough common sense to just talk to one another they would not be in this mess in the first place!