We need to keep Nuclear Weapons out the hands of terrorists.

Preventing nuclear terrorism is a very difficult task. Countries needs to secure and remove at-risk nuclear materials from sites around the globe, so they cannot end up at the hands of terrorist groups.
Terrorist groups in possession of nuclear weapon is more terrifying than state owning any type of weapons. Terrorists will use it to inflict the greatest damage to the society and destroy the civilization.
A terrorist nuclear attack is the most difficult threat to deter. While opinion differs on the likelihood, all experts agree that such an attack is possible, and as the consequences would be so severe, the threat demands the full attention of the world’s leaders.1

References:
1. I g o r I v a n o v a n d S a m Nu n n NTI