Morality as I define it is the distiction between right and wrong as it applies to our interactions with living things.
Religion has been used to teach rules for making moral decisions but cultures that do not have religion use social guidelines or mores very similar to religious tenets.
Even in societies considered "amoral" such as organized crime there are tenets governing behavior.
Having worked in prisons and youth treatment centers I can tell you that a set of moral codes exists though the mirror is often flipped over between what is right and what is wrong.
So the question for me would be if a person had no interaction with other people would they have morals and how would they develop these morals ?
In my opinion those who are able to create and enforce morality through laws and codes while breaking those same morals are the ones that generally prosper and thrive while those that follow the morals are rewarded with survival and those that resist and defy the morals are removed.
Once a corruption of morals takes place it also usually results in a revolution by members of the society that see the corruption and either want to re-establish the morality to society or see that the morality was based on false tenets and see an opportunity to overthrow the creaters of morality and take their place.
Is there really such a thing as morality ?
I believe morality is the result of mans desire for survival and having rules and codes of conduct within a society gives some security of survival by justifying the actions of those in power.
Once an individual no longer relies on a society for survival it is up to them to define their own morals and I believe these morals are stripped down to its barest form if they exist at all.
For an individual there is no longer a need for morals once they are responsible and capable of providing for their own survival.
Cheating, lying, stealing, and murder would no longer be necessary for what would it benefit the individual ?
So I do not see that existentialists living an independent life based on personal responsibility would need morals and that would probably be perceived by others as having a very high moral standard!