You don't understand our voting system.
Basically we haven't had a ruling government that's had a majority vote for years (not in my lifetime at least). MPs [are supposed to] represent constituencies which are drawn up to be roughly equal in population. What happens is that each party, when in power, 'corrects for population shifts' and re-draws boundaries to concentrate supporters into a few areas and spread the opposition over multiple areas.
This is why 'minority' parties can get a sizeable chunk of the vote but few (if any) seats in parliament - their support is diluted across wide areas.
The net effect is that the outcome is largely governed by a few marginal constiuencies (wher the balance is closer) who have a disproportionate effect on the outcome. A majority of just 1 vote in these places will (under first past the post system) make a huge difference; where I live, they gould put up a gorilla for election and it would win if it had the right coloured rosette!!
This benefits the two main parties who thus have no interest in electoral reform or proportional representation.
Couple this with the fact that you have to vote for a person 9effectively a party) rather than an issue, and that all the parties are converging so there's little to differentiate them, it's no wonder voter apathy has kicked in and turnouts are low.
So, no, please don't blame all of us for the actions of a few.