100% agree with this statement. You can't tell someone who put their money into bitcoin at 19,000 to "stay positive." That money might not ever come back, and the loss of 50% of their investment is a big blow to not just their bank account but their motivation towards investing in crypto. It takes a very unique and strong-willed person to keep investing in something that they lost so much money in. People shouldn't stay positive no matter what the price is, they should stay smart. If anyone plays their cards right, they will have the opportunity to make money.
Even if a person bought at 19k or something,they can still profit. They can always prefer to trade/invest in different ICOs/gambling sites and make profits. Just because you bought at 19k and now the price is 8k doesn't mean that you'll forever be in a loss unless the price goes above 19k. God knows,how many days/months that will take. Be smart and know your shit properly.