He was an English Catholic, who fought in the 80 years war, against the English and our allies. He wanted to assassinate the King and establishment to replace them with a 9 year old, when the dominant religion was Protestantism. 'will of the people!'
In many respects his failure allowed Cromwell's influence to move the country away from monarchy towards parliamentary dominance.
Now given that you've quoted Cromwell and Guy Fawkes as figures to be heralded, it does seem a position which is slightly at odds with itself.