I don't think Stoicism argues for purposeless enduring of pain and wrongs.
But reflects on a person's freedoms.
“When we are no longer able to change a situation, we are challenged to change ourselves.”
― Viktor E. Frankl, Man's Search for Meaning
Though there may and often be situations, in which it is better to change one's environment.
Take peers as an example, there are toxic peers one is better off avoiding, but one cannot always do that, for example family, school, work.
But if they and the situation cannot be removed, what remains of our freedom, is to change how 'we 'react and 'feel to such.
“If you are distressed by anything external, the pain is not due to the thing itself, but to your estimate of it; and this you have the power to revoke at any moment.”― Marcus Aurelius, Meditations
"Sigmund Freud once said that, if you take a widely diverse set of people and starve them, soon all their differences will fall away to be replaced by “the uniform expression of the one unstilled urge” for food."
"That didn’t happen “in the filth of Auschwitz,” writes psychiatrist Viktor E. Frankl in Man’s Search for Meaning: An Introduction to Logotherapy."
"There, the “individual differences” did not “blur” but, on the contrary, people became more different: people unmasked themselves, both the swine and the saints."
“We who lived in concentration camps can remember the men who walked through the huts comforting others, giving away their last piece of bread. They may have been few in number, but they offer sufficient proof that everything can be taken from a man but one thing: the last of the human freedoms -- to choose one's attitude in any given set of circumstances, to choose one's own way.”
― Viktor E. Frankl
People do not all 'react the same to situations,
Then obviously of course, there is some difference in the people.
. . .
I think Stoicism can have a recognition of perspective.
“When faced with people's bad behavior, turn around and ask when you have acted like that. When you saw money as a good, or pleasure, or social position. Your anger will subside as soon as you recognize that they acted under compulsion (what else could they do?)”
― Marcus Aurelius, Meditations
“Love all people, including those who do wrong. They may be acting unintentionally, out of ignorance. Even if they are acting intentionally, they can’t harm you—that is, they can’t make you a worse person than before. Only you can harm yourself, by fanning the flames of hatred and resentment. When someone wrongs you, identify the mistaken ideas that motivated their behavior. Then, instead of being angry, you’ll pity them.”
― Marcus Aurelius, The Meditations
I think such perspective is 'common in philosophy.
113.“Confucius said, “When you see wise people, think of becoming equal to them. When you see unwise people, reflect inwardly on yourself.”
Consider Mencius and Ox Mountain
or the Bible
Berean Literal Bible
"But as they continued asking Him, having lifted Himself up, also He said to them, "The one sinless among you, let him cast the first stone at her."
I do not think a recognition of causation 'must lead to Nihilism.
Berean Standard Bible
"for all have sinned and fall short of the glory of God,"
Think of the parable of the sower, people of different mettle might take to the word different,
People in different circumstance might hold to the word different.
. . .
"Alongside Aristotle's ethics, the Stoic tradition forms one of the major founding approaches to virtue ethics.[66]
The Stoics believed that the practice of virtue is enough to achieve eudaimonia: a well-lived life.
The Stoics identified the path to achieving it with a life spent practicing the four cardinal virtues in everyday life — prudence, fortitude, temperance, and justice — as well as living in accordance with nature.
The Stoics are especially known for teaching that "virtue is the only good" for human beings, and that external things, such as health, wealth, and pleasure, are not good or bad in themselves (adiaphora) but have value as "material for virtue to act upon".
Fortitude, a willingness to confront pain, agony, danger, uncertainty, intimidation is bad.
It seems to me 'good to be strong in life.
There are times when pain must be withstood, if we are to achieve certain ends.
