Bitcoin's volatility will never be controlled, just look at other commodities like gold and see the big swings that happen there. Even fiat currencies often have large swings in their valuation.
Although not anyone can't control Bitcoin's volatility, but they still can make the mentality of trader panic, fearing, happy, interesting ... as their want anytime. Just by some breaking news, they can "control" all crypto on market with support from trader on market 