Abstaining from voting is a useful way of sending a message to the political parties that they're failing the public. Of course, this only works if its joined by a significant number of other woiuld-be voters. Obviously, the cost is that in the short term a party will be elected with a minimum of votes but, at least hopefully, it will open up the door to those who want to meet the needs of voters that have chosen to withdraw from the process.
Unfortunately, something like that has been going on in the UK's inner cities for a few years now, largely in response to what has been perceived to be a reluctance by the mainstream political parties to openly address issues of race and immigration. Consequently, there has been a massive rise in far-right parties in these areas targeting the disenfranchised white population.
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