As I said before in this thread, people voting against their own interests is hardly unique to the States.
Here's a poll in Germany that, among other things, found this:
Here again is that disconnect. This poll's coming not so long after the main party of power, CDU, gained even more seats/votes in the last election.
The voice of the voters can have a bigger role if and when they start actually voting for people who will represent them. Voting for the same couple of parties over and over and over again will not achieve that result.
Or to put it another way: if those 60% are truly representative, they had more than enough power to change up the government in the last election to where they could trust their voices are being heard. Same as in the States. Or Britain, or Spain, or or or...