Tituba conjured spirits for them because Abigail required her to do it.
Parris has discovered Abigail's disappearance, which shows that she may be guilty. If she is, in fact, guilty he has helped kill off several of the townsfolk. At this point, he has been threatened. Someone stabbed a dagger into his door in order to warn him that this should stop. He is afraid that the court will be overthrown and he will be killed.
Excuses: They disapprove of Parris, They were struggling to get by and had to do what they could to make it through
Abigail- Uses it as a tool to get rid of Elizabeth, but when Mary tries to be honest for a minute, it almost exposed her as a lecher/liar.
Mary- was making it out of guilt, but it sort of proved that Abigail was either attempting to murder Elizabeth or that Elizabeth was a witch
Hale quit the court because he realized it was a sham.