The status quo of where the top parties go is a consequence of the voter's attitudes, because of the vote they don't actually have the power to just force an un

The status quo of where the top parties go is a consequence of the voter's attitudes, because of the vote they don't actually have the power to just force an unpopular option. The reason they are presenting policies you don't like is because they think (probably accurately) that they will win them more votes than they lose. If a top party were to not do this, they would quickly lose relevance, ceding dominance to the other party and then setting the stage for another party to gain power. A third option doesn't actually reasonably exist, in any voting system, unless the electorate and parties reach this state, it's just FPTP needs tactical voting to reach accurate representation (even in systems which result in many parties in government, you will have coalitions which form compromises and you get voters who did not get much at all of what they voted for).