Exactly Shirley - your view and hopefully that of millions of others across the world. The argument that 'it won't do any good' is like the argument that a vote for a party that won't win is 'wasted'. We should all have learnt one clear thing from Farage: you can get what you want without ever getting to make the decision yourself - without ever actually winning formal power.
These things are not win/lose - you can do some good without achieving the end result you hoped for - history is replete with examples of struggles that seemed to be frustrated, or utterly defeated - but in retrospect we see they were part of a movement that changed the world.