Why is Thomas bitter?

One of the wealthiest landowners in Salem, Thomas Putnam is a vindictive, bitter man who holds longstanding grudges against many of the citizens of Salem, including the Nurse family for blocking the appointment of his brother-in-law to the position of minister. Putnam pushes his daughter to charge witchcraft against George Jacobs, for if he is executed, his land will be open for Putnam to purchase.