Charles I was not a Catholic. He was staunchly Anglican.someone who believed God gave him the right to rule when actually the people did and got executed because he defied that (Charles I),
her Protestant subjects were the ones who rose against her. With the encouragement/support of that same English queen she supposedly tried to have murdered. At best, all Mary knew was that they were planning to do away with Elizabeth, she did not give the order or even know the details. Under legal standards, she'd get accomplice (maybe manslaughter at best).If you include the monarchs of Scotland in that too, you have Mary, Queen of Scots, who fought her people over her religion, spent decades imprisoned and tried to murder the legitimate Queen of England!
And let's not forget how many Catholics Elizabeth had executed (aside from Mary). Some in far more brutal ways than her half-sister ever did. After all, neither Catholic Mary would've had a pregnant woman (St. Margaret Clitherow) executed. Of the Forty Martyrs of England and Wales, Elizabeth is responsible for the death of more than half (that's not counting the portion of the Seventy-Five Companion Martyrs of the English Reformation that she was responsible for). How many Protestants did Mary, QoS execute solely for their beliefs, not for any other reason like she'd made Protestantism treason? Did she have any executed without trial (like most of Elizabeth's half?) Did Mary, QoS pass a law forbidding the entry of Protestant ministers into her realm like Elizabeth did with the Jesuit Act of 1584?