> A single party state is not an inherently evil thing.
There’s different kinds of single party states: first, a transitory single party state that “single party” because the current political climate leaves only one party currently competitive but where other parties are not structurally prevented from competing, and thus factionalism within the dominant party will lead to the single party condition being short-lived (e.g., the U.S. during Democratic-Republican single-party rule in the 1810s-1820s.) This, while it can have problematic aspects, is not inherently evil or inconsistent with democratic governance.
On the other extreme are systems where the dominant party has a structural (possibly in-law) monopoly or at least privileged status. As systems of public governnance, these are inherently evil.