Alexias, here are the facts regarding arsenic poisoning from the CDC. But I fear the facts will only get in the way since you think you already know it all.
"The primary routes of arsenic entry into the body are ingestion and inhalation. Dermal absorption also occurs, but to a lesser extent.
The half-life of inorganic arsenic in humans is about 10 hours [Rossman 2007].
Arsenic undergoes biomethylation in the liver.
Approximately 70% of arsenic is excreted, mainly in urine [Rossman 2007].
Arsenic is excreted in the urine; most of a single, low-level dose is excreted within a few days after ingestion.
Dermal absorption is generally
negligible, although toxic systemic effects have resulted from
rare occupational accidents where either arsenic trichloride or arsenic acid was splashed on workers' skin."
You can read it all here:
Arsenic Toxicity Case Study: What is the Biologic Fate of Arsenic in the Body? | ATSDR - Environmental Medicine & Environmental Health Education - CSEM
Further more, the primary source of arsenic in pyrites is arsenopyrite, called arsenopyrite for the obvious reason. It contains arsenic (very very small amount.) It is only ONE Of many sulfides (pyrites) as there are many others, such as chalcopyrite, cubanite, and others. So you show a video of pyrites burning and cry 'arsenic' ... so how do you know what pyrite is burning there anyhow?
Here is a list of the sulfides, and if you examine the chemisty of each you will find most don't carry arsenic.
The Mineral Gallery - Sulfides Class