Thing is, that Cersei was a different Cersei that we have now. Cersei with 3 kids would've definitely done it but I dunno about Cersei without any, I dunno, maybe being pregnant has chilled her out some more and she has to think about what will happen to her unborn baby if she doesn't form this alliance.
Definitely. Losing her kids has given her less to lose and heightened her ruthlessness. Still, there's nothing to suggest it stripped her of any & all rationality.
you what now? Sending him to the wall is not putting differences. Just because Joffrey is a (dumb) cunt of supreme proportions (only Ramsey would have done this), it doesn't show some mercy or work out for her.
What exactly can Cersei do to Tyrion? She has zero power, and her son is too much of a punk bitch by that time to do anything to Tyrion either.
The third point literally ends with all of them being blown to pieces, what did she do to work with the Sparrows? She aligned with the Sparrow because she underestimated him so he could hurt the Tyrells.
Saying that, I can see her forming an alliance while waiting to stab them in the back (in this episode).
I'd say allowing the person who revealed your biggest, most dangerous secret to the world, almost tearing down your entire House in the process to live period is a big deal. An irrationally evil cunt would've killed Ned outright and worried about the consequences later -- which is exactly what an actual irrationally evil cunt did do.
She could've have slipped something in his drink during their many wine sessions, or hired someone to have him killed(again, which is what Joffrey did). Even after he had Myrcella sent away she struck back in a way that didn't jeopardize the defense of the city.
And why did it end in everyone getting blown up? The Sept bombing doesn't happen if Margaery didn't ruin the Tyrell/Lannister plan(which Cersei facilitated) to take down the Sparrows by force by playing her own game. Margaery delivered Tommen to the High Sparrow who used his new found royal authority to send Jaime away, strip Cersei of her trial by combat right, and have her stand trial in the ways of old. The Sept bombing was literally a desperate last resort.