That's not really true. In Australia, plenty of bills get passed with bipartisan support; you just don't hear much about it as it's not newsworthy. But on issu

That's not really true. In Australia, plenty of bills get passed with bipartisan support; you just don't hear much about it as it's not newsworthy. But on issues that are pertinent to each party's ideological position and the expectations of their members/voters, they will take strongly opposed positions. This is important, so that voters have different options to choose from, and that each party must argue convincingly for their policies when campaigning. If the parties are in consensus on most things, you end up with something not so different to one-party rule, and possibly endemic corruption.