I'm a sys/net admin with 15+ years of experience and I can tell you that the biggest threat is YOURSELF! Just make a typo as root and kiss your system goodbye! Happened to me twice, I have learned the hard way... You don't have to  

Some examples (do not try this on your masternode):
rm -rf .*
mv / /dev/null
find -type f -mtime +30 -exec mv {} /dev/null \;
whatever > /dev/sda

Play it safe, log in as a regular user and use sudo!