If you mean that humans sometimes do more than the bare minimum, sure they do that. But that is an inherent part of humans, that has nothing to do with individualism or collectivist systems, humans do that in all systems, that is a part of the value of a human worker and why you pay them to work for you.
Because I know people that work there, and money surely isn't the first reason you are teaching a bunch of brats while having parts of the public look down on you if you can easily get double the amount somewhere outside of the field. Same for political work, crowdsourcing, .. People take gratification in doing something that matters to society. Yes, they want to survive, but they are quite often not doing it for the money, the money is a nice bonus and enables to do it full-time, but that is not always the reason you do it.
Also you are goalpost moving, you said first they are only doing it only for themselves not for "the company", and people often do it for the institution that employs them. Not because they are paid, but because they believe they are doing something that matters.
That would apply to those teachers and doctors and nurses as well, almost all of them would gladly abandon their current kids/patients to go help other kids/patients if they were paid twice the salary. That is how we know they aren't there for the collective good of the organization, they just care about doing something good at any place with no feelings for that particular collective.
If you mean that people are helpful etc, then that is a completely different thing from them actually caring enough about a particular organization.