Why was the Romanov family executed?

[GUBU]

I am at a loss with what occurred during the Russian Revolution. Part of me thinks it was good a monarchy was overthrown, but at the same time something just as bad or even worse followed it. However, I recently learned tonight while watching a documentary on the Russian Revolution that the Romanov family was brought into a room at midnight at executed by multiple gunmen. Even their children!!! 

I never knew this. And yes, you cannot ignore history. But when I saw this in the documentary it literally broke my heart. 

I do understand that Lenin's older brother was executed by this regime, but damn. This was a tough pill to swallow.

Because the city they were under house arrest in looked to be under imminent capture from the White Russia forces (monarchists) and the local Bolshevik leadership decided a living Romanov was too dangerous to the Soviet caise. Irony being that the Moscow leadership didn't want him killed and even went so far as to request from the German and British governments that the Romanovs be given asylum (Wilhelm, Nicholas & George being first cousins).