There are many other people to blame.
1. The Putnams. Mrs. Putnam was fixated on assigning blame for the death of her children. She had already resorted to witchcraft to find out who "murdered" her children, so was quick to jump on the accusation band-wagon. Thomas Putnam, we learn in act three, had been "prompting" his daughter to cry out against people whose land he wanted to take when they were imprisoned.
2. Reverend Parris. Quick to blame those who didn't like him, and to try to win favor in the town by being a lackey to the judges, Parris often sided against the townspeople, asking incriminating questions and giving the judges prejudiced backstories on people brough into the courts. He also conveniently left out the fact that his own niece had been caught dancing and concocting spells in the forest; desparate to protect his reputation, he didn't tell this information.
3. Danforth and Hathorne. These judges often rejected logical fact, devised tricky scenarios and questioning, and refused to hear testimony that would prove the innocence of so many that were accused. Once it became clear the accusations were false, they clung to their pride, refusing to recant convictions, so that their reputations wouldn't be foiled.
Those are just a few people that contributed, and were all too happy to jump in and ride the wave of accusations. I hope that helped; good luck!