Superheroes fight crime and save lives. But by doing so they impose certain costs on people not directly involved. These are superhero externalities.
Since Los Angeles went to hell and back, Angel has become something of a celebrity. Now everywhere he goes, people are starstruck. Seems pretty simple and non-threatening. As in any transaction, Angel reaps the benefits of being famous (more casework, more money, etc.) but also pays a cost for it (less free time to brood, a sense of disillusion, etc.).
Unfortunately the people he is protecting are paying an unintended cost, as demonstrated when Angel walked into a local coffee shop for a cup and accidentally created a panic that the neighborhood was under attack by a vicious (and equally fictitious) demon. This seemingly innocuous event resulted in multiple injuries and death.
Angel himself goes on to comment on this predicament of unintended consequences: