In FPTP, if your vote doesn't elect the winner in your constituency, it was wasted. Even if you voted for the eventual government party in a seat that the party didn't win. Your vote did not count. In other electoral systems, it does count.
FPTP means that one vote in one area (e.g. a "safe seat") is not equal to one vote somewhere else. Knowing the geographical distribution of preferences makes gerrymandering possible, and elections have been won not by fair voting, but by unfair redistricting.
FPTP massively punishes any "similar" parties with a vote-split, meaning parties have to become mega-alliances and ultimately they are ground down to just 2 parties. That's the only stable configuration. Any third party has to be mercilessly destroyed, otherwise it will start taking votes from the party it is most similar, leaving their opponent an easy victory.
That's what happened in the 2024 election: Reform UK no longer had the electoral pact they had with the Conservatives in 2019 (where Reform UK voluntarily withdrew from any seats the Conservatives were likely to win), and as a result, the vote-split between Reform UK and Conservatives let Labour romp home to victory.
* Labour got 63% of the seats with 33% of the vote.
* Conservatives got 18% of the seats with 23% of the vote
* Reform UK got 0.8% of the seats with 14% of the vote
* Lib Dems got 11% of the seats with 12% of the vote
That is manifestly unjust. Reform got 5 seats for 4,117,610 votes while Lib Dems got 72 seats for 3,519,143 votes. If that's democratic then I'm a banana.
My point is that all votes were counted. Some people disagree with the winning choice, but it’s still their legitimate government chosen in a free and democratic election.