They don't need to have a violent revolution. They can just vote for a different party in the next election cycle. If the votes aren't there, revolution wouldn't succeed anyway.
"They can just vote for a different party in the next election cycle."
The last time they tried that (2009), the different party was literally more of the same. The only thing worth mentioning about the following two elections was their extremely low turnout (the lowest ever in Japan's modern history in the latter).
Revolutions do not need a majority. I think our best guess is that fewer than a third of the then colonists (USA) supported the proclamation of independence.
It is true though that with FPTP, you don't really need a majority to win elections either so it might be a wash.
The last time they tried that (2009), the different party was literally more of the same. The only thing worth mentioning about the following two elections was their extremely low turnout (the lowest ever in Japan's modern history in the latter).