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Because the rightful throne of the House of Stuart was usurped by William Stadholder aka William III aka William Of Orange after the Battle of the Boyne in Ireland in 1690. He was there to make sure that the then expanding British Empire was well and truly in their hands from them on.

The true heirs have all been usurped as well as the Stuarts in the "Glorious Revolution" (glorious for who ?) , the Bourbons by their French Revolution, the Romanovs by the 1917 Bolshevik Revolution, and the Hapsburgs and the Ottoman Caliphate by WWI .

All the remaining "Royal" families in Europe are related to Orange( including those some of whose members may still posses a deposed family's name) Cromwell incidentally was also one of their puppets. The execution of the Charles was their first blast at Revolution.

Did you know he sacked and slaughtered the garrison at the Irish walled town of Drogheda, (also situated on the river Boyne) on September 11 1649! Just a coincidence,eh!

following Cromwells' conquest in Ireland maybe as many as 100,000s of Irish were sent to the West Indies effectively as slaves, replaced eventually by Africans more suited to the climate.

In subsequent centuries the growth of slavery, opium and colonialism enriched the now well inter-married Satanic dynasties just as their modern counterparts, people, illicit drugs and arms trafficking and the military industrial complex does.

No doubt you know already too that David Cameron has family roots in the East India Company.