Martha Carrier was an independent woman who had an argumentative personality and wouldn't let people take advantage of her. Moreover, she was accused of spreading smallpox and arguing with her neighbors. So when she was accused as being a witch, she fought back against her accusation. Furthermore, Sarah Good was a poor woman who was known for her aggressive attitude and random outburst against others in Salem. Her aggressive attitude made her a prime suspect for witchcraft against others she didn't like. For example, Elizabeth Hubbard accused Good of sending a wolf to stalk her and obtain information. At her trial she was aggressive and denied the accusations, but because of her past, she was accused of being a witch.
