let's take it piece by piece
there will be manipulations that will happen, where in you bought bitcoin in as higher price
There's always been manipulation and it was not stopped or will this ever stop even if there is regulation in place
i have a friend who put all he's retirement's money on bitcoin during the all-time high
believing the news that it will reach up to $50k only to find out and woke up that the market collapse
Blame your friend or whoever advice him to put his retirement funds to invest in Cryptocurrency, it's always been the old adage only invest what you can afford to lose if he follows this advice and he still invests he should not blame anyone even the market
some of my friends bought a miner then the next day they can't make any profit and the price of the miner
is so expensive,
Again not doing research and proper calculations, easiest way to lose your funds.