The first past the post two party systems lock that in.
Australia has a preferential voting system, and our two main parties are actually one primary centre-left party and two smaller centre-right parties that have formed a coalition.
Doesn't stop us making dumb voting decisions every three years, though.
Ideology determines how we view the world (and thus the issues) and what we want it to look like. Politics without ideology is impossible, there is no objective "null ideology".