Mate, far right parties, especially in Portugal want anything but debate. Their whole message is to pollute discussion and make the extremes normal.
A lot of people vote for them as protest but also a lot of people like their racist, fascist rethoric and goals. This is not a “them poor misunderstood far right parties”.
Fortunately no party is collaborating with them so their biggest impact is making sure that a right government can’t really govern.
That being said, every party has their blame in this by not solving problems or improving people’s lives as much as they should have. Another way to fight this is by having proper alternatives that people believe in but that’s easier said than done.