So the reason why bitcoins price drops are a good thing because it's a price correction and the price is going back to its normal level.
The so called correction is an excuse for bulls when the markets go red.
There is nothing miraculously healthy in a correction, it means the coins where overpriced and some bought at a price they should not.
Let me give you an example.
We are at 2k we go till 7k then we shave a small correction down at 6.5k and here we go till 7.2k
What was so healthy in the correction? Did it prevent a bubble from popping? It did nothing but stale the growth for a period.
There is no such thing as "correction" , there is only one price that is the right one and that is the price shown by the market, there is no such thing as "normal" level.