No, they aren't. The best time to have invested in Bitcoin or even own it in my opinion would have been before the ATH but investing in Bitcoin now isn't a foolish idea, because the probability of Bitcoin going beyond the ATH price is very high, and investors investing now would gain over triple what the invested.

The thing is a lot of people in this period may be begin to invest cause of Fear Of Missing Out. But that's also helping the market as the more Bitcoin becomes popular and the more investors invest in it, the higher it's worth, value and it's price. It's not at all times fear leads to irrational decisions, sometimes it pushes us to change ourselves and our lives. So, in conclusion, the people investing now, out of fear and out of knowledge aren't fools but are people actually helping the market.