It may not right to blame anyone but you have to realize that market manipulation is not about some whale selling to push the price down or conversely about t he whale buying to pump it up. It is about the considerable portion of the market participants making a bad decision usually based on some FUD. So for example if what we call "weak hands" start panic selling just because some moron said something negative about bitcoin, then we can blame them.
We go back to what I said earlier: we want people who understand bitcoin to adopt it not people who are here to make a quick buck. The later are the ones that enable market manipulation.
People mostly don't change, can not change themselves, and they repeat mistakes cycle by cycle. Strong hands will have stronger hands with time and market cycles because more market cycles mean more experience to help them to understand more about the market, and realize efficient result from holding strongly. People who have weak hands firstly because they have weak mentality, that can be strengthened by having more knowledge about Bitcoin, Bitcoin market includes market cycle, and psychological cycle, then have more experience in the market.
Unfortunately, with weak-handed, weak-mental people, they mostly can not change and will be more possibly repeating their mistakes in previous market cycles, and lose money again.
Psychological pitfalls of market cycle.Wall Street cheat sheet: the psychology of market cycles.Wolong: Dogecoin and the game of deception. It's a classic example on how to manipulate a market based on psychological cycle.