Aggression is behavior that is intended to cause harm or pain.
Curses are spells that are often intended to cause harm to another person.
Curses are a form of aggression.
What is a curse?

1) a form of aggression
2) Something coming from a gland
3) after too much water received
4) forest is destroyed
5) friendly behavior
6) a form of love
7) nonaggressive
8) death and devastation