I might have assumed people’s interpretation but a lot of people seem to think that all Samaritans are perceived as good and a good Samaritan is one of them. For example in this cartoon they just use the phrase Samaritan when they mean a good person.

Also I don’t see the distinction between “the Samaritans are enemies of the Jews but this one helps” and “the others (Samaritans) are bad but this one is okay”