Now that he is guilty, maybe Alex will tell the truth about what happened that night. I think there are lot of inconsistencies that that leave open questions. Not to Alex's guilt, but how it all went down.
1) It happened so fast, its difficult to kill them both unless you went ambush style. It seemed more crime of passion/opportunity than planned, especially the way Alex reacted and panicked right after. Basically the 2 shooter theory.
2) Alex only seemed to try to want to hide evidence of Maggie's murder and not as much Paul's (took her phone, hid the gun etc).
3) Alex said multiple times in interviews that he wanted to clear Paul's name, never talked about Maggie. What does that even mean after Paul has been murdered?
4) Killing his family doesn't really get Alex out of any financial crimes. If Alex was willing to plan out a murder to hide the financial crimes, he would have killed someone that could tie him to them.
So from my convoluted brain from listening to podcasts only, this is what I think happened. Paul was basically an evil child. Boat crash, housekeeper, man in the middle of the road, all surrounded him. If we are talking circumstantial evidence, its all over Paul as a murderer. So either
1) Paul shot Maggie (because he was just evil) and Alex killed him
or
2) Maggie finally realized her son was rotten and shot him, and she was subsequently murdered by Alex. Shotgun and low angle make this more likely than scenario 1. Then Alex took out Maggie with the Blackout which would be a tough gun for a lady to handle.
Alex is too proud to admit that Paul was what he was and that the Alex Murdaugh family was just plain f-ed up. He'd rather lie about it all to protect his name than have the public think his family was a failure or had any flaws at all. In either scenario, Alex was covering for Paul. He's either clearing Paul's name for being evil or clearing Paul's name for killing his mother.
I'm 100% sure Alex killed one of them and should spend the rest of his life behind bars.
I'm 100% sure that Alex's hubris is what hung him by his nuts.