Which plainly shows that it does not apply.
That it is completely irrelevant to the tangent at hand.
yet you drive down your non-relevant road as tenaciously as a thief fleeing the bank he just robbed.
Most interesting.
It was a passing remark that I think tenacity is a positive attribute in most situations. Keywords being "I think", hence, this is my opinion that tenacity (especially coupled with courage), can be a positive attribute under the correct circumstances.
How am I being tenacious? I stated an opinion, you asked for an example, I gave you many - but apparently not to your standard. If it's that important to you, outline criteria that will meet your standard of evidence and I'll probably be able to find an applicable situation.
Edit: If you want me to be tenacious and needlessly argumentative, that can be arranged lol. But unfortunately this is a situation in which tenacity is not desirable.