i wouldn't call that a "drop below $1000" because obviously it didn't last at all. and also because it was a one time big sell off that ate through the orderbook and that will always happen when someone sells a big chunck of bitcoin or anything else in any market at once.
the important thing was the come back that only took less than a minute to complete and price came back up to $1150 in matter of minutes.
It wasn't that people themselves dumped the price down to below $1000 levels. It was more the result of stop loss order triggering each other, where you see a short lasting deep red candle. I am quite sure that a wealthy entity has done that on purpose. Especially when you also take the massive green candle that resulted in a peak at +$1350 levels into consideration. It's a way to eliminate the "competition" (often referred to as small fishes).
How its dump because of the people. Price is depend upon the supply and demand. There many investment on bitcoin related business and block chain technology from the year 2014.
Sure price will be driven to 2000$ before this year ends. Due to mining reduced in last halving this effects take first in September. From that time to now we are seeing raising face of bitcoins except one dip.