Why not?
Doesn't even the party that you did vote for do things with which you disagree?
I can complain about the monarchy; didn't vote for them either.
Do you really think one vote every five years is "having your say"?
We've also seen the chaos caused by giving "the people" an extra vote.
As I said, lots wrong with our voting system.
But I don't know of any other legitimate choice to try and change things. And if you don't even try to change the leadership, then don't complain about things never changing!
Voting is always a compromise (if you research what each political party stands for and wants). Sometimes it is right to vote for the devil you know. Sometimes you have to vote for the lesser of 2 (used to be 3) evils.
But if you don't try and change things, don't complain if they never change.
The chaos caused by the extra vote, I agree. Were the voters fully informed? Should we have had a vote? But it doesn't detract from the point of a General Election. Or otherwise, let's not even have any more Elections and just let the current lot run the Country for ever?
It is not the system I would like, but until then........