In democratic countries, civil servants aren't supposed to be changed after each elections, while they have their individual opinions they know their duty and follow the orders that come from the political power (and should they not obey to the order from above, there are disciplinary sanctions that can be leveraged against them).

And it's not some theoretical idea, in all Western democracies, every civil servant that has been in place for long enough has seen governments from multiple political sides. That's how it works.

Using illegal means to purge the institutions from undesired people is not something that happens in a democracy, this is unprecedented in the West since Gleichschaltung.