In Australia it is mandatory for all eligible to cast their vote. Its not in the UK, where in the 2015 election only 2/3rd of people cast their vote.
In 2016, 27.8% of the electorate did not cast their Brexit vote, That means almost 80% of the population did not vote for Brexit (equally a higher number did not vote to stay). A small percentage of the non voters in the EU referendum could have changed the result.
We don't know how the non voters would have voted, they may have voted for or against or have been indifferent and destroyed their ballot papers.
We have democracy .. it is flawed and sometimes when you see some of the politicians seemingly with their noses in the trough, you despair and become disengaged. But then you see the late Jo Cox and Mhari Black and you see the good in politics.
This election is an election of importance like few, if any in my life time. A choice between:-
The old style politics and the new style.
An American style economy and a peoples economy
The welfare state and welfare by market forces.
Nuclear armaments and non Nuclear
Hard Brexit and a more consensus Brexit.
These are big decisions and ones that will affect this country for decades.
Everyone must participate in the decisons, especially the young