One can take advantage of a power if they are selfish
Explanation:
If you are asking how someone can abuse a power in real life, an example would be someone who is famous and using their power as a celebrity to make people hate someone, which is selfish.
In fiction, A super hero can use their powers to make people give them things so they won't get hurt which is another example of selfishness.
If you are talking someone using their power positively, then one can take advantage of their powers by helping others.
