Its either they are total newbie in the scene and just doesn't understand everything about Bitcoin due to lack of information about Bitcoin or they are just total scared individuals because what only came up on their mind is those volatile movement of Bitcoin.
If people would just explore things and open their mind to new opportunities they learn then backed it up with research provably they would find that Bitcoin is a good investment for them. Then they would never say those words that its late to buy Bitcoin.
We all know that bitcoin investment gives us more profit compared to gold. Everyone has also felt failure with bad experiences but should not regret it. We must take important lessons from this experience. Our future depends on how we overcome our experiences, no matter good or bad. I am still very optimistic about the future growth of BTC.
Personally I don't look at how much bitcoin could give me within a short period even in this current bull run but I see bitcoin as a store of value that I could save a good percent of my wealth since am still young and has less to carter for, and perhaps in 10 years plus I will be getting ready to take responsibility of myself and also someone else hence I would have a good return of investment instead of saving in fiat that will depreciate in value over a long period of time.