According to John D. Clare from johndclare.net, he stated that:
"Appeasement is 'giving a bully what he wants'. Hitler built up his army. After 1936, he reintroduced conscription, and war-tested his armed forces in the Spanish Civil War. Britain and France turned a blind eye to these breaches of the Treaty of Versailles."
The British and French let Hitler rose to power to the point that he already becomes the threat to the world security.