A reason small parties (the Greens for example) can get deputies is as a result of bargaining with a big party (PS for the Greens). The PS and the Greens are currently hashing this out for next year, and having a job agreeing on numbers. The agreement, of course, is of a coalition nature; the PS will give the Greens some safe seats in return for Green support elsewhere.
No party negotiates this kind of agreement with the FN.
It's a vexed question, whether it's better to collude to keep the FN out, or let them in. They have no respect for parliamentary government, and dynamite it on every possible occasion. And they are not asses. Had they maintained a regular parliamentary presence over the last twenty years, I fear they might be even bigger today than they are.
If instead of actually fighting to get the protest voters back in the fold, the mainstream candidates can just collude, they get comfortable and the problems that the FN capitalizes on fester. Then if and when the Fn breaks through the enclosure, it does so catastrophically.
It is quite clear if you're going to have single-seat constituencies you should use single transferable vote. guaranteed to evoke a violent reaction from police is to challenge their right to "define the situation." --- David Graeber citing Marc Cooper
