I think some of them are just newbies and don't know the right time to goes in for an investment. I have a fair share of experience for brought in when coin at ATH so I always look at any pumping with caution, not reckless buying without any thinking.
Right, thinking before buying a coin is a very appropriate thing, because without a clear thought, someone will always lose in the steps he made, including people who already have experience in crypto.