When creating an argument, we must always remember that there are two important parts to it: first, the argument itself, which is the position that you as a writer assume and will defend through factual data, and the counterargument, which in a certain way opens up the posibility that you might be wrong in your assumptions. As such, an argument in this case could be like this:
Situational forces, are the moments in life, situations, circumstances, or events, that force a person to act in one way or another, even despite his/her personality traits. As such, they generate stress and tension on people because these situations force the person to behave in a certain manner that may very well go against his/her own way of being. For example, a person may normally be extroverted and secure, but, in a stressful situation, like facing a bank robbery, a person may become cowardly and act totally different to what he/she is used to. Because of these factors, which mostly come from within a person, it is very difficult to assume that a person can be blamed for acting in a certain way when faced with a situational force. However, this doesn´t mean that people can always blame situational forces as the sole reason for wrong, or inapropriate, behaviors, as people also have something that is called free will, which helps them to, as much as possible, correct, at least in part, the wrong actions during a stressful moment.