Earlier quoted context omitted.
Mother Theresa once said that when she looked upon the many she could do nothing, but when she focused on the one, she could do something. The same applies here. Someone needs to be held accountable. Change needs to start somewhere.
I'm not sure Mother Theresa is a good example for anything, but regarding the general argument you are making here: There is a huge difference between helping one person (decreasing the general suffering by a tiny but attainable amount) and making one person an example (hoping this changes the status quo somehow).
Ortiz literally did not do her job. She over-prosecuted a case, apparently for personal advancement and DoJ-vendetta seeking, that was worth no more than a misdemeanor at best.
Sure, it's a problem that "the system" allowed her to do so. But it's also a problem that she abused the system, destroyed a life, shows no remorse, and will likely continue to abuse the system if not removed from office.