When someone asks 'what's the use of PHILOSOPHY?' the reply MUST be aggressive, SINCE the question tries to be ironic and caustic. Philosophy does not serve the State or the CHURCH, who have other concerns. It serves no established power.
Whenever SOMEONE like a plumber or a mechanic tries to EXPLAIN something technical to me, I LISTEN for about three seconds before it all just BECOMESWHITE noise, like Charlie Brown's teacher.