Because, in addition to being an amoral pseudoscientific dumbass, he doesn’t even believe in the validity of debate himself.
Should a conflict arise between the witness of the Holy Spirit to the fundamental truth of the Christian faith and beliefs based on argument and evidence, then it is the former which must take precedence over the latter. (Reasonable Faith, Third Edition, 48)
There are a whole bunch more quotes there at the link where Craig basically endorses faith as a last-ditch bolthole to dodge any argument based on evidence and reason. So why waste any time on him?