You're right of course about the austerity measures that have been pushed and has kept any sort of recovery from happening, but there are a lot of voters all over the world that don't really know the REASON that things aren't getting better. Perhaps a majority don't. So these are the one who hear a far-right pol saying, "Immigrants are taking our jobs! Ban them!" and they think that sounds correct, so they vote right. When the right gets power and their life is STILL in the crapper, they vote for the ones like SYRIZA who say, "Elect us and we'll demand that capitalism treat us right". Then the SYRIZAs of the world can't do anything either so they swing even further to the right than before.
I'm a Marxist of the Trotskyist tendency, so I feel I KNOW what the problem is with the economy and why it's stagnated since the so-called recovery AND the reason why the capitalists are still calling for austerity. It's because the falling RATE of profit doesn't bring in ENOUGH profit for the bourgeoisie to feel like they can reinvest in the productive sectors that create jobs and wealth for the rest of us. Austerity and its partner in crime privatization, open up the revenue streams for the private sector to begin to RAISE that RoP to levels that they believe will allow for that reinvestment. The RW solutions don't work because they buy into the NEED for austerity and the left social democratic solutions don't work because they are STILL beholden to the capitalists and can't force the system to go against its imperatives RE: the rate of profit. In short, they both leave capital in the driver's seat and capital says that austerity and privatization is what is needed.