> Attitudes are slow to change, despite clear and compelling evidence.

I am not certain, but it appears you are comparing formic acid use to cyanide abuse. The use of formic acid in hives is legal, and is applied in a safe manner. The mixing of cyanide and sulfuric acid in a bucket is not a valid comparison, which is extremely dangerous to the operator and potentially bystanders. However, neither has been shown to leave significant residues in honey. 

> Residues of CN in a variety of honey products from experimental treatments of bee colonies with Cyanogas A-dust, beekeeper facilities, packing plant and a number of retail sources in Canada were found at very low levels. Residue data from this study were submitted to the Evaluation Unit, Control Products Section, Plant Products Division, Agriculture Canada, and permanent registration was secured for Cyanogas A-dust and G-type fumigant for destroying honey bees after the honey crop is removed. 

M. Ihnat & D. L. Nelson (1979) Cyanide residue levels in extracted honey, comb honey and wax cappings , Journal of Environmental Science & Health Part B, 14:1, 39-51, DOI: 10.1080/03601237909372113

> Formic acid fumigation ... does not leave residues above natural levels already in honey (Stoya et al. 1986; VonPosern 1988; Liu et al. 1993; Bogdanov et al. 1999).

Underwood, R. M., & Currie, R. W. (2003). The effects of temperature and dose of formic acid on treatment efficacy against Varroa destructor (Acari: Varroidae), a parasite of Apis mellifera (Hymenoptera: Apidae). Experimental & applied acarology, 29(3-4), 303.

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