In the USA we defend against tyranny of the majority with the constitution. The constitution places strict limits on what the majority can do to the minority through governmental force.
A political system should be a strong constitution that defines the rights of individuals. Something like DemocracyOS should be used to engage the population into ensuring that political actions are in fact constitutional and just.
At the federal level we can change the constitution if we get enough votes. But its hard to achieve such a consensus, as it requires more than a simple super-majority. So it always comes down to thresholds.