Yes they can, because that's what "discrimination" means: differences in outcome due to uncontrollable irrelevant factors like race. Discrimination is an effect, not an intent. Racist intent is called "prejudice". Discrimination can be caused by prejudice, or it can be caused by something else, like a poorly considered algorithm.
No, that's pseudo-social-science because it falsely assumes outcomes are solely determined by external variables and is completely ignorant of internal variables, such as differing cultural values.
Some cultures value family life over money, others value money over family life, for example.
I'm sorry, this reply doesn't make sense to me. What does "different cultures are different" have to do with whether computer systems can be discriminatory or not?
you should ignore that comment, it's an incredibly disingenuous claim intended to mask the racist sentiment that 'non-white people are over-represented in american prison populations because they don't value not being in prison as much as white people do'.
I think it's important to note that there is no algorithm that can have an "intent". If we are to agree that racism is a feature of intent, then there will never be a racist algorithm. Yet the outcome will still be discriminatory.