You better go to the fucking voting booth and vote against Le Pen and do it with a smile.
Standing by and doing nothing to stop crazy Le Pen would be an outright betrayal against our european ancestors who died in the millions to form what our generation got to enjoy.
There are absolutely no excuses and no wah wah, my principles would wash the literal blood off your hands if Le Pen were to be elected, Frexit and sink the entire EU.
Edit: That came off more agressive than I wanted, sorry. I'm just fed up with "I couldn't vote for Hillary Clinton, I just couldn't"-esque rhetoric. Donald Trump got elected because people didn't want to "choose between the lesser of two evils".