I don't think that it's normal for a Bitcoin investor to be emotional about his or her holdings, unless you are investing with an amount you can't do away with, but if you are investing with an amount you can afford to lose, bro nothing is making you emotional about your holdings
All investors are human, not robots or bots so human all have emotions and everyone is affected by human emotions. Difference is between people who can be more or less disciplined than others and have better or worse risk and capital management.
Those things are either well controlled or bad controlled that will decide those people reactions on a same market. You can have positive or negative emotion and feelings about the market but if you manage risk and capital well enough, and if you are disciplined enough, you will not either do FOMO purchase or panic sale. Because almost everything you do with your investment portfolio and decisions of purchases and sales are done very disciplined and less likely emotional affected.
I understand what you mean and this will mainly happen to brand new investor who wants to start their bitcoin investment or just started because they don't understand bitcoin and might have doubts on bitcoin. Such people should only invest with little amount as small as $ 10 to DCA regularly every week, so that they wouldn't bother that much but as time passes on and they continue learning about bitcoin and seeing the price movement and gaining experience in the market, this will strengthen them to gain more confidence in bitcoin maybe, after one year or two.
When they have gained confidence, they can increase the amount of money that they're using to DCA and invest aggressively to cover up their whimpy accumulation pattern in the beginning. Having a long-term mindset and bitcoin target can strengthen you not to be emotional with the price movement.