First past the post means that everyone who didn't vote for the "winner" is ignored. No representation in their democracy. As the other comment said, a party c

First past the post means that everyone who didn't vote for the "winner" is ignored. No representation in their democracy. As the other comment said, a party can in theory get 100% of the seats/power with 51% of the vote. FPTP was more relevant when local politics mattered and local MPs actually made a difference to lives in their local area. Post-war the only decision making that matters is at the national level which FPTP cannot represent fairly.