The blast power of a nuke is the sum of all the particles bonds splitting. Anti-matter supposedly annihilates the atoms themselves. Now if the bonds can blow up Japan, then the particles could **** everything.
Electron's colliding with Gold makes antimatter? Yeah right. Woman on wedding night gets electrocuted and Kaboooooooooooom. There goes Hawaii.
Electrons smashing into at near light speed(super-colliding) maybe?
Anti-matter is another example of a viable technology which hasn't been used due to testing and safety procedures and guidelines.