if you aren't fighting for yourself then you aren't fighting for anyone
solidarity means SHARED COMMON INTEREST
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one thing i do agree with early marx about is that socialism is the struggle for the SOCIAL LIFE OF MAN, a struggle in which we can ALL BE UNITED through a SHARED COMMON INTEREST which need not be manifest in the INDIVIDUAL OR EGOISTIC LIFE of INDIVIDUAL PERSONS
they do matter, and they matter especially when you have some socialists coming in with dogma or trying to instil a universal social life predicated on white western ideals of what society should look like
what time has shown however is that many socialists have very different ideas of what this social life should be like or how it should be structured
these questions do not stop us from organizing against a neoliberal regime which seeks to quash all human social life indiscriminately, but considering they are the reason we fight (for socialism) it would be folly to say they don't matter