In any case, there is no country in Europe in which anti-immigration parties have an absolute majority (> 50%), let alone an "overwhelming" one [0]. So to answer your question: yes, democratic decision making is important to me, especially such that it actually reflects the will of the electorate and not some wish a minority within it has.
Or that immigration simply isn't their most important policy, even though they support stricter measures.
Imagine you have a choice between two parties: party A wants to detonate an atomic bomb in the capital but also create well-funded animal shelters. Party B opposes the destruction of the capital city, but they want to turn all puppies in the country into kebabs. What do you vote? You don't want to eat ground puppies, do you?
If these are the only party choices an electorate has, it seems to me they have bigger problems. And so option C, the people don't vote, hence giving neither party a mandate to do what they want?
I really struggle to see how an example this obtuse has any analogy to reality.