As for long-term Bitcoin holders, I don't expect them to be panicking about the price of Bitcoin after they have understood the basics of Bitcoin. I don't really see why someone should panic about their Bitcoin investment when the history of Bitcoin has already shown that Bitcoin holders have great opportunities to make more profit from Bitcoin. So, for anybody who wants to enjoy their Bitcoin investment and make reasonable profits, they should have a mindset of holding Bitcoin for the long term. The easiest way to accumulate Bitcoin without much worry about the price is by using the DCA (Dollar Cost Averaging) method, which involves buying on a regular basis.
No matter how you see this, there are still some people who don't have this confidence in the price of Bitcoin and that's because not everyone is your long term holders some Bitcoin investor are just after their little profits of which is very risky.
The people you are mistaken for investors are actually traders that buy to sell when they see profit. That is not investment if we need to set the record straight in line with what we are discussing here. Investors are those who buy and hold for long and calling traders investors might be confusing to people and make them think that trading is just another form of investing in Bitcoin but in reality it isn't.
Panicking when the price drops is a actually a sign of not knowing the true value and worth of Bitcoin. The same panic that is done with the amateur holders the experts and determine investor see as a window of opportunities to actually buy when the price is up.
In addition to all you have stated, panicking can also be a sign of not going about the investment the proper way. You can trust Bitcoin and have strong faith in it hence invest what he cannot afford to hold for a long time. Consequently, any drop is price usually will set you on panic mode and it will surprise you how much you will be worried psychologically.