I always figured Stanger was trying to get close to seckto, and eventually deal with him, for what he had done to the other steef.
I reckon like Munch, Steef are seen more like monsters, or more mythical or so, rather like a centuar (Which is an obvious insperation for his design) or unicorn (Except that no one would kill a unicorn, but I guess maybe that's the symboligy)
Also, Stranger was smart and hid away while the Steefs were being hunted, he desicuised himself and intended to get an operation, basically what Max said.
And I think Stranger is not the only Steef, and there would be no efforts in bringing them back as was done in MO, I think they would moreso reunite.
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