price went up so fast to $19k and suddenly dropped by 16% today without any rational reason with huge liquidations happened on exchanges. Does anybody else see a conspirasy theory here or it's all pure coincidence?
It's perfectly rational and was widely expected. It always happens this way. It's neither conspiracy nor coincidence. The price drop is simply a natural consequence of the preceding price rise. It's cause and effect, nothing more than that.
Any dramatic price rise is a rise away from support levels, into a new fluid domain where no-one knows where the price 'should' settle. This is particularly true when we are in the vicinity of an ATH. For us holders, the ideal outcome to any price rise is a brief period of oscillation around a stable point, which then establishes solid support that sets us up for further growth in the future.
Prices can't rise indefinitely without stopping. And when they do stop, they are unlikely to do so abruptly, perfectly, and in the 'correct' position. It takes time to settle. Don't panic!