Why did Queen Mary I deserve her nasty nickname?

Queen Mary I earned the nickname "Bloody Mary" primarily due to her harsh persecution of Protestants during her reign from 1553 to 1558. Her efforts to restore Catholicism in England led to the execution of hundreds of Protestants, including prominent figures such as bishops and reformers, who were burned at the stake. This brutal crackdown on religious dissent painted her as a tyrant in the eyes of history, contributing to her negative legacy. Additionally, her tumultuous reign and political failures further tarnished her reputation.