Referendum or voting in their representatives. As an example, assume 80% want to introduce racial segregation in each of the UK, Australia, the US and Canada. What measures would stop them?
For example, the potential election of candidates within a subset that escapes that 80%, as enabled by systems similar to those listed, which have exactly the purpose of approximating optimal choice.
None of the systems you listed will protect against an 80% majority wanting to force through specific legislation. Through brute force they will get their way eventually and inevitably.
If you disagree, I hope you can give a more fleshed out example than, what seems to be, to be the vague handwaving you have been doing so far - no offense intended.
Majorities may be used technically but it is not the majority of the population that determines the policy (which remains indirect anyway).