Read the debate between Harry and Potter and identify the main issue?

Harry: Within democracies, voters are entitled to know the down-side to a candidate and the other side is obviously well placed to voice it. To stifle one‘s ability to voice negative things about a candidate would be to obstruct democracy and limit free speech.

Potter: Negative advertisements produce the politics of the personal, since an easiest advert is an attack-advert which focuses on the personality or personal qualities of one‘s opponent. A negative advertisement is one that focuses upon a rival product, in this case, a rival election candidate or party in order to point its flaws and to persuade the public to not vote for it.