Of course, Loqi's suggestion could contingently be less optimal than the less easy to accept presentation.

While the approach you suggest could provide a more subjectively negative experience, the cognitive dissonance could cause the utterance to gain more attention with the brain as a more aberrant occurrence in its stimuli and as a result be worthy of further analysis and consideration.

I am generally in favor of delivering notions I believe to be helpful in a manner which can/will be accepted. In some cases however, others are able and more likely to accept a less than pleasant delivery mechanism. This is contingent upon the audience, of course, as well as the level of knowledge you have about your audience. In the absence of such knowledge, the more gentle approach seems advisable.