There are many ways to motivate a person, character, what have you. Many people might think motivation is mostly positive -- mainly because there is a certain hopefulness to something like motivation -- but there is an unpleasant side to what drives someone. I'm sure there is more than just one type of negative motivation for many people, but the thing I wanted to focus on was hatred. Whether it is revenge or some type of prejudices, hatred is a pretty strong emotion that can both motivate the people with said hatred, and cause them to perform some irrational actions if the feeling is strong enough.
I've noticed this is quite clearly woven into the world that Wizard Barristers: Benmashi Cecil has displayed in the couple of episodes I've watched. There are also a handful of anime that this topic encompasses -- like Sekai Seifuku: Bouryaku no Zvezda and Toaru Hikuushi e no Koiuta -- but I'm going to focus on Wizard Barristers and Sekai Seifuku; this more so has to do with the similarities to the point I want to make with both of these anime. So lets start with the first anime I mentioned, that being Wizard Barristers.
Magically Malicious
From the rather vague description I started out with for Wizard Barristers, I didn't really get to what hatred that was in this series. The prejudice coming from many non-magical humans toward Wul -- magic using humans -- was displayed pretty clearly right on the first episode from the police who arrested that one Wul on the run. Although the Wul was in fact someone that used his magic to kill people, there is still some lingering nasty assumptions coming from many people who are prosecuting Wul -- which is the reason I use the word "woven" into the world.
When personal biases -- like hatred toward Wul -- comes into something as important as a courtroom, it can be a recipe for disaster. Things like fact checking could be overlooked completely, leading to a wrongfully prosecuted person thanks to someone else's non-rational reasoning. And this is probably one of my biggest pet peeves; whether it is some personal belief, long running practices, or anything that isn't somewhat arguable toward a third party -- not within that stipulation -- it shouldn't be brought into consideration for law; which actually leads quite nicely into the next anime, Sekai Seifuku.
Smoke and Mirrors
In the 3rd episode, of Sekai Seifuku, we were promptly introduced to the fact that most of Zvezda was not only against smoking in their hideout, but also any place at any time. Now I'm not someone that particularly enjoys people smoking near me -- matter of fact I have asthma and it is quite unpleasant -- however, that doesn't mean smoker don't have the right to at the very least smoke outside where it is less likely to get that secondhand smoke. So when Zvezda went full retard, it was very annoying to see more of the smoker being driven to a smaller and smaller area just to enjoy the product they spend money on.
This is pretty similar case with Wul and the non-magic Human. Whether you like or dislike something, there shouldn't be something outlawing an action, or type of person, simply based on personal belief. Even if there is an argument to be made about the harmfulness of smoke inside of buildings, these don't really apply to smoking outside that much; and we pretty much bring the base argument to, "I don't like the smell of this smoke. Yuck, yuck". That type of stance doesn't hold up in the platform of the justice system and I'm quite glad that Zvezda didn't conquer this front of what is smoking -- even though they did get pretty close.
Dissipate
Really to wrap up, no matter what your opinion of something might be, if it motivates you enough to want to change something in someone else's life, you better be sure to at least have something objective to back up your argument. Since so much of the world is based on having some kind of starting point, it is probably best to convince someone -- especially those in the law side of things -- with that actual facts in the matter, rather than subjective beliefs.