Explain the importance for terrorism

I don't consider terrorism is important taking into account it kills people, so for me it isn't important

Terrorism is essentially pyschological warfare, usually committed by radicals of often controversial ideologies or political parties, such as the IRA (Irish Republican Army), or ISIS. It’s important due to the sheer amount of casualties it can cause and the emotional impact it can have on a nation/population. Terrorists feed off fear and work to disrupt everyday life and create a sense of insecurity in order to achieve their goals. Once a country cannot function normally due to terrorism, and its leaders submit to terrorist’s demands (done to achieve a political agenda), that is when they win.

They weaken the south vietnamese army.