How can Steem loose value? Please answer in Comments. All responses appreciated

I am down to Hand-wringing. I just fail to understand the way Steem is going.
Who are those willing to sell substantial amounts at such low rates?
Has anyone responded on behalf of Steemit?
Last time Steem went down to 20 cents I had joined the Spud20, this time I am doubtful it had any effect.

US Dollar= Propped up by Government bullying the world

Yuan = Pushed down by the Chinese Central Bank

Euro = Held in check by member nations and US influence

Bitcoin = Rallying due to vast acceptance

Steem= Falling WHY???