"a permanent solution to a temporary problem" does apply to some cases.
So as an expression, it has some validity, and it may help some people correctly decide against CTB.
However, it doesn't apply universally to everyone considering CTB.
When the expression is applied to cases where it may not apply, then it can understandably cause anger, etc.
However, there is validity in putting that expression "out there", since it may catch those people to whom it correctly applies.
An unfortunate side effect will be those without enough experience taking that phrase as a universal truth.
Those with more experience should ideally "forgive" those of less experience for this error, since in a previous life we may have been those same people.....
In the context of a one-to-one discussion, that expression should only be used if it genuinely applies to the case in hand.....
The more spiritually mature you are, the more you can see all the different angles without having to become angry, etc, although this may not be very "satisfying" to the human self, but then again the human self may be one of the key obstacles preventing enlightenment.....