Also, they seem to also relate Bitcoin investment to gambling, saying thinks like risking to win, and it's wrong, people need to stop treating bitcoin investment like a gamble and only waiting for a dip to buy which is also wrong, waiting for the price to go low before buying everytime you want to buy also marks you out as a trader not even an investor, and most trader are just gamblers masquerading as investors.
It is lack of knowledge that is causing it, mate, probably after they have been liquidated or scammed by so many shit coins, they thought it was the fault of Bitcoin. People that doesn't have precise knowledge about Bitcoin will talk or think different foolish things about it.
If you can see anyone that had bad investment with Bitcoin, try to ask them question about their experience and you will know that they were at fault in one way or another.
Yeah, some people have their notion drawn from their past experiences, some people allowed greed to lure them into investing into scam sites promising high ROI and they got scammed, they now channeled such anger to Bitcoin investment calling it scam, meanwhile their irrationality and naivety set them up.
Some even underplayed security concern on their devices and linked their main wallets to claim faucets leading to their wallets wiped out, some clicked on phishing links and their wallets got drained too. All these sometimes stems from ignorance like you pointed out which isn't their fault, but the crypto space is merciless.