Brief information about the setting. There was a big war going on between two countries. Let's call those countries A and B. Each living in different continents. While they were evenly matched A caught an advantage and pressed it and B out of desperation decided to cast a gigantic spell that would summon an army of demons against their enemies.
Long story short demons did destroy their enemies though the demons also destroyed their own army and now the continent the demons were summoned is now uninhabitable. How would the country A view magic after witnessing such destruction.
Note that magic is normally considered extremely critical both army wise and infrastructure wise.