You can look at the following parameters that are critical for the health of democracies: electoral process and pluralism, civil liberties, the functioning of g

You can look at the following parameters that are critical for the health of democracies: electoral process and pluralism, civil liberties, the functioning of government, political participation, and political culture. And consider how moderation of hate speech affects these parameters. Evaluating these on an example of presidential debates of 2020 might be a good option. As there is a contrast between the first debate, that included no moderation and a second debate, that included some.