Why was Tsar Nicholas II inated?

I keep reading about it but a lot of the responses are so warped with so many things happening at the same time that for someone with as little patience as me, it doesn’t make much sense. I did read somewhere that he did something bad… got people killed or something… and the Bolsheviks felt they had to take immediate and severe action which included not only inating him and overthrowing his reign but killing his entire family too! Something like that…I think… The question is why? Ugh. Anyway, I’m just looking for the most direct answer, basically dumbed down. Thanks!