Nostalgia can be seen in a positive and negative light. I know everyone likes to reminisce about their past because it takes us back to a happy time where we didn't have a care in the world. At the same time, it can also be negative because you can also be reminded of all the negative events that took place in your life. You can be walking down the street one day and can smell something that triggers a memory from your past whether it be good or bad. Everyone has nostalgia.
Anger is more dangerous. Anger can be caused by multiple things. Being angry can put you in a bad head space and you can lose control. There's no coming back from that once you have made a decision while being angry. Your actions are in the heat of the moment and sometimes that can have deadly consequences. That is my intake on this.
-Mads