"Mild" Jesus?

In his book, Your God is Too Small (1961), the late J.B. Phillips wrote:

Why mild? Of all the epithets that could be applied to Christ this seems one of the least appropriate. For what does "mild," as applied to a person, conjure up to our minds? Surely a picture of someone who wouldn't say "boo" to the proverbial goose; someone who would let sleeping dogs lie and avoid trouble wherever possible; someone of a placid temperament who is almost a stranger to the passions of red-blooded humanity; someone who is a bit of a nonentity, both uninspired and uninspiring.

This word "mild" is apparently deliberately used to describe a man who did not hesitate to challenge and expose the hypocrisies of the religious people of His day: a man who had such "personality" that He walked unscathed through a murderous crowd; a man so far from being a nonentity that He was regarded by the authorities as a public danger; a man who could be moved to violent anger by shameless exploitation or by smug complacent orthodoxy; a man of such courage that He deliberately walked to what He knew would mean death, despite the earnest pleas of well-meaning friends! Mild! What a word to use for a personality whose challenge and strange attractiveness nineteen centuries have by no means exhausted. Jesus Christ might well be called "meek," in the sense of being selfless and humble and utterly devoted to what He considered right, whatever the personal cost; but "mild," never!