I had hear of these before but knew that people were fucked up long before I did which is one of the reasons I like to avoid them when I can. The bystander one is tricky I stopped and tried to help a guy who was bleeding pretty bad from cuts his face once in college when he began attacking the car I was in and screaming at us. That dampened my willingness to help people at times unless they look harmless.
To be fair, there is only partial truth to the bystander effect. It depends on various factors really. Quite a few people are just exceptionally helpful to others when needed, for example. Other factors involve the number of people around in such situations, your capabilities (or lack of capabilities) to help, whether or not you know the person in need of help, your role in society (are you a police officer or someone whose duty is to help), what the cultural expectations are, what traditional background you're from, religious/secular mentality, and so on.
Also, let's not forget the core rule of the bystander effect. The larger the crowd, the less likely any person in the crowd would make the first move to help. The smaller the crowd, the better.