Me stretching trying to make sense (answers)out of some of these questions...

>Why does Lex Luthor blow up the Senate hearing and kill his
>assistant?
>At least I think Mercy Graves is killed in the explosion.
>It’s hard to be sure, but she seems to disappear out of the
>film after that sequence.

To get rid of the Senator opposing his import of the Kryptonite. Extreme, but because he can. And any kind of violence remotely involving Superman I imagine would start to make people turn against Supe, regardless of it it was his fault, trouble follows him.

>At any rate, the important question is “What does Lex hope
>to gain by blowing the place up?” He already has the
>kryptonite in the country, so he doesn’t need to eliminate
>Senator Jar of Piss immediately or in a particularly grand
>manner.

Because he wants to be able to weaponize it for all including armed forces to have against Superman?


>- Flash travels back in time to warn Batman in a dream? Huh?
>
>Flash is hard to hear in this sequence, but he warns Batman
>that he was right all along, and that if Lois dies Superman
>goes bad. But that doesn’t come into play in the film ever;
>Batman never is concerned about Lois’ safety - he doesn’t
>even know she’s ever in danger. Batman never brings the
>incident up again. It has no impact on the story at all. If
>you removed it from the film nothing would change beyond the
>running time.

I don't think it was a dream, I think Flash actually jumped multiverses to warn him and that is what woke him from the dream.

Did he mean that Lois was the key to getting Supermans attention?