Because right now in Europe simply, the left-wing views are not very popular.
It is very hard to compare it to USA politics, but in Europe, the right-wing is not as far right as Republicans and left wing is all over the place.
Right now in Europe most welfare programs are already very good to the point of creating a backlash. There is a big anti-immigration wave going on as well as an economic crisis during which the left-wing ideas of spending money on basically helping the poor achieve equality are not popular.
Just look at France, their left-wing president and the whole "leftist" form of government made a country where a huge amount of workforce is employed by the government, nobody can get fired because the unions are so strong, the tax rate for rich is at exorbitant rates yet there are tons of programs to assist the jobless, the immigrants etc. This means that if you're poor, France is not a bad place to be, since there are a lot of programs to help you, but there is also no incentive to create wealth and become richer, because the system will bring you down.
I think that politics and worldview are a bit like a pendulum with occasional swings to one side or another. America is way too capitalistic to the point of creating a cutthroat environment, while France is closer to communism than USSR ever was. Both cases are unsustainable since both ideologies at their absolute don't work, therefore the opinion will swing to the other direction (of course taking into account historical and cultural tendencies this correction may be strong or mild, I don't expect USA to have strong worker unions any time soon just as much as France abolishing the right to strike).