Why are childproof and holy war oxymorons?
Quite often, only children can open child proof things. My brother had a childproof lock on his fridge, which the grown-ups couldn't fathom, but his toddler managed to suss out!
As for Holy War, that would be an oxymoron to modern minds (another oxymoron??!) who think religion should be soft.
And... what is wrong with Sensitive men, and legal principels?
There's nothing wrong with them. The idea is that they are contradictions in terms. Sensitive men? Well, apparently men are insensitive. And legal principles? Do lawyers have principles??
Of course, these are generalisations, but they're meant to be humorous.