if all investors are patient, they're unlikely to fall from such situations and they'll even thank themselves for learning how to be patient.
Being patience and investing are highly related but
the basics of investment principles are not limited up to that level. What would happen if you invest with a saturated business or an asset with no future, there being patience got nothing to do with your profits. I mean to say being patience will help only if you are good at choosing right assets. You need to be skilled for where to be patience and where to switch your investments often.
Although these rules sound great, in practice it is much more difficult. First of all, investing requires money, and many people in this world struggle with money... There is never enough of it.
Investments is a method to achieve the state of having "enough money". Yeah, people struggle for money but not dying because of starvation of money in most part of the world. So, you may invest 10% or 20% of total money which may help you to tackle your struggling for money. If you are not ready for those 10% or 20%, then your struggle will last forever.