Davenport and Armstrong (2004) lists several other studies and states: "Repeatedly, democratic political systems have been found to decrease political bans, censorship, torture, disappearances and mass killing, doing so in a linear fashion across diverse measurements, methodologies, time periods, countries, and contexts."
Davenport和Armstrong(2004)則列出了其他研究並表示：「研究再三的顯示，民主政體都較少發生政治取締、審查、酷刑、失蹤、和大批屠殺，包括各種測量的尺度、方法、時間長度、國家、和背景都得到這樣的結果。