Sorry did you mean tax burden? Debt burden makes no sense so I'll assume so. Ok, so you seem to be claiming that France's tax system has caused inequality, debt, social problems and political instability. I'm sorry but this is just nonsense.
Inequality:
This is really obvious, but anyway... Over time, France's taxes have got less progressive, like all the other European countries. And this is why it's less equal than it used to be - as with all those other countries. It's not because of progressive taxation, it's because they've dialled it back. It still has highly progressive taxes relative to other countries, and is still a relatively equal country as a result.
Indebtedness:
Across countries, the relationship between indebtedness and progressiveness is negative, not positive - France's debt is in spite of it's relative progressiveness not because of it. The US, Italy and Greece are all much more indebted and much more unequal. The Scandi countries all score low on both. That's the general trend, not the one you imply.
Social problems/instability:
Again, both strongly associated with inequality - did you see the graph I shared? Honestly it's pretty strange to single out France as having social problems - it is totally unexceptional in Europe in this regard. As for the far right problem, why highlight France when the good old US of A have just actually elected the fascists? Are you going to blame their tax system? Didn't think so.