To be patient in investing, we must first understand the investment well and it is absolutely impossible for someone to persist in investing without properly understanding the investment they are making, that is what is experienced by those who panic when they see the price. Bitcoin is decreasing because they don't understand how it works. Bitcoin is good and for some people who understand it well, there are also those who take advantage of this opportunity to be able to collect more than usual so they can profit from the investments they make.
I think the first thing that needs to be questioned is what I'm I investing on and how will I get a good ROI from it and this should be done before anything...
I didn't get what you are trying to pass very well but I do get an idea that it's about investing without proper knowledge about an investment...and you used the case of a dip as an instance that might make an investor to withdrawing his/her investment if I'm right...
Anyone who invest on something must have heard and done research about it... you can't blindly invest In what you don't know
Although, Using the case of Bitcoin as an example learning and understanding bitcoin is on a large scale which will take years to understand not even completely but getting to know and research on what's it's all about shouldn't take more than a day... so there's no excuse of "Blind investment "

Majorities of investors who withdraw after a dip are short term investors it's not that they don't know how Bitcoin works but they are just after the short term profit which they feared they might not get after a dip.
Bitcoin doesn't work that way .. there's only one way to panic which is short term investment , however a long term investor need not any worries about a dip as its always considered as an opportunity to buying more.... Learning never stops actually you might want to always remember that
ROI should be consider first as new investor but should not be the ultimate measure for any investor to invest in what they like, little knowledge is what every Bitcoin investor need, remember there are level of research that can lead to diacouragemnt thats why as an investor what is required of you, is just the basic knowledge which is the major starting point of an investment.
Bitcoin is a continuous process, no one stop at a point of learning in Bitcoin but what I strongly believe is that many investor has there goals to achieve, it may be long or short term goals and it is left for individual investor to take such decision, despite that Bitcoin dip period is considererd to be the best time to accumulate more Bitcoin, people are allowed to do whatever they choose to do with their holdings, IMO I will advice that it would have been better for investors to understand the concept of Bitcoin before investing because with this they can be able to decide whether to go for short or long-term investment.