The bottom line is that it is kinda required for Bitcoin to crash occasionally for the prices to rise higher eventually.
I think what you're trying to say is that crashes are needed to redistribute bitcoin to the strong hands from the weak hands. In order for the price to increase we will need people with a lower willingness to sell but that doesn't mean that we need a crash for such a thing to happen.
Crashes are useful in ways, take for example the last one, if we say 6k is the bottom, we now have many who bought in for large amounts at 6k, they will then be holding strong for a while more for a considerably higher price, whereas we maybe lost a lot of people who had initially bought in the 1-3k range and were willing to take their profit.
While I agree with the premise, the simplicity of it is that it all comes down to demand and supply at a certain price.
Crash in a market is normal specially for bitcoin. People tend to sell their bitcoin specially if government and/or news like regulation, ban and fork is spreading. I saw different news like this that makes the market crash but OP is right- Bitcoin will just soar up once again.