I like the idea of manipulating memories to get NPCs to do what you want. However, it looks like that is more of a gimmick than a fundamental gameplay mechanic in this game. The memory manipulation is basically a slightly interactive cinematic, with only one path to success.
Making the guy commit suicide should be only one of many different solutions. If your primary objective is to stop the guy from gaining power, there are many ways to do that. You could manipulate his girlfriend's memories and convince her that he was having an affair, causing her to speak to the media and ruin his reputation. Or you manipulate some random dude into thinking the target raped his wife and have him shoot the target during a public speech. Or you could convince someone that they are the illegitimate child of the target, which always creates a media sensation.