I think sp1814 has (as he usually does) got to the heart of the issue early on, and stuck to his argument in spite of some serious sidetracking.
Essentially, the issue is this, as i see it.
Was Hitler good at public speaking? Yes. In the same way that Gary Glitter was a good pop star, and Jonathan King was a good producer, and Harold Shipman was a good GP.
The fact is, all these individuals had a deep dark side to their personalities which is not in any way mitigated by those skills.
Therefore, if you try and point out the skills of such people - regardless of how valid your argument is objectively, it will instantly be buried under the scorching scorn and derision that the very mention of their name creates, due to thier huge infamy which eclipses anything else about them in the eyes and minds of the public.
So, with the simple fact in mind, it can be seen as monumentally foolish to try and use any of these individuals a 'good example' in any context.
For a politician to use Hitler in this conext is so stupid as to beggar belief.
No-one would dispute the truth of what he has said, but the truth is not the issue, it's the infamy that has buried it too deep to be seen ever again.
This politician is guilty of startsospheric misjudgement at a level which makes him unfit for public office - not for being wrong in what he said, but for the crass thoughtlessness with which he said it.
As advised, there are other orators to quote who do not have the history that Hitler carries - use of their names is likely to keep the matter in hand and not score such a massive own-goal.