I'll try my best to answer the questions based upon my opinion. It's probably a bit late now, but I'm going to say that you shouldn't read on if you don't want spoilers. So yeah, SPOILER ALERT!
1.) I think she's gone partially (if not fully) insane by this point and is also consumed by guilt. She knows she played an important part in the death of her husband and that she lied so that he would be killed. This is eating her up inside, as it would any person, so she's in conflict. The unblinking gaze of her mother-in-law is also key to her going mad. Tae-Ju owes this woman her life, even if she didn't treat her perfectly, at least she had a home, food and stability. The mother-in-law also told the priest about her leaving the shop to Tae-Ju because she's "good deep down". If after all that murdering her son and being very, very ungrateful isn't a little saddening, then you must have very thick skin! She is also probably scared of death, knowing that the priest is capable of tearing her apart and is most likely very angry that she lied to him. When she eventually drank from the father, this showed her becoming the psychopathic killer that she later became. The last shreds of her dignity and sanity are gone, she is no longer the woman she used to be and now has no remorse. She may harbour a grudge against him for bringing her back to life, killing her in the first place, or just because he's weak. That's all I can say on that matter.
2.) The only explanation I can give is that the whole film is about him betraying his morals and religious belief. He's killed, traumatised, stolen, broken his vow of chastity and committed a host of other sins. He fully believes that he's going to hell, thus he might as well go out with a "bang"...If you'll excuse the pun!
You say that he is the more sane and moral vampire, but he's not much better than Tae-Ju. After all, he's still a murderer. He's helped people commit suicide after telling them at the start of the film that suicide is even WORSE than murder. He's damned, he knows he's damned, he can do what he wants at this point and hope that the act of stopping the killing and rampage by (oh woah, ultimate sin overload) killing himself and Tae-Ju redeems him slightly...
Hopefully at least one of these ideas has helped you out. If not then I'm stumped!
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