Answer:
If I were to add something that would make my argument against slavery more convincing I would probably say something like what is the roles were switched, would you want to be a slave?
When people went to Africa or when they bought slaves they would often say something like it was in the bible and because of this that it was okay when this was not true so you could possibly use that to help your argument against it. There are probably better answers out there but I wrote a argument against slavery once and I used this stuff in and got a pretty good grade.
The biggest difference between the Watergate Scandal and the Iran-Contra Affair is that the Watergate scandal was an internal politics problem, while the Iran-Contra Affair was a foreign politics problem. Both scandals were exposed by the media.
In the Watergate scandal, president Nixon was directly involved and exposed by the media as head of a group perpetrating illegal activities while it was never proved that President Reagan was directly related with the illegal aid to Contras and Iranian terrorist groups. So President Nixon was directly involved in the scandal.
The Watergate scandal was worse in my opinion because it is more famous and it was the only presidential impeachment in U.S. history, and that undermined the public image of american democracy.