The notion of refusing to debate so as to avoid 'giving credence to deniers' has perhaps no more famous (infamous) proponent than Deborah Lipstadt who refused a platform with David Irving.
(Note to Nessie Irving is not an ACADEMICALLY trained historian, but once had such an authoritative profile that professors, who were accademically trained histiruans, told their students that they would fail unless they quoted him), so confident were her defence lawyers of her ability to put her foot in her mouth that the refused her to even speak once in Irving's libel case against her.
However, what is there to debate, exterminationists, in their endless contortions, have already proven the truth of the glassing story' by the inevitable consistency if truth, even though it was unintentional, it's simple as follows.
Varying explanations for the presence, it absence, of blue stains on walls.
1 presence of stains inside a gas chamber', proof of heavy use and lots of people gassed
2 absence of stains, proof that only low dose was used and penetration is shallow and not permanent
3 absence of stains in exposed areas, proof that stains wash off when exposed to the weather and
4 presence of stains on the OUTSIDE wall of a gas chamber', proof that mattresses had been stood against the wall after fumigation
Apply Occam's Razor of simplicity to this nonsense, hydrocyanic acid residue penetrates deeply into wall material and indeed right through brick walls and remains resistant to deterioration even after eighty years.