It is not the same as serein gas, period.
Correct. And mustard gas is not the same as Sarin gas, and chlorine gas is not the same as mustard gas, and on and on. All do not have the same lethal potential, nor do they all function in the same way. But people
have died from exposure, (especially indoors) to tear gas. And if you ever have the opportunity to read the cautions on a tear gas projectile it clearly states its life-threatening potential and precautions.
So it is not a weapon in the same category as sarin, but it is a weapon nonetheless. Its common use outdoors in controlling mobs should not convey the impression that it's harmless. Its use indoors
can kill!
As wrong as Waco was, it was NOT wrong because they used tear gas. It was wrong because of the way that it was executed as well as the level they elevated the event to. Where a simple arrest would have sufficed, they stormed the compound and endangered innocent people.
The use of tear gas was not the problem and it CANNOT be compared to using nerve gas. That would be akin to comparing a Taser (also deadly in the right circumstances) to a cruise missile. They are in completely different fields.
Everything about the Waco raid was wrong, from beginning to end. And while there is no evidence to ascertain that the tear gas used started the fire, there is an equal lack of evidence it didn't.
Those who wish to draw an intelligent conclusion about that are urged to read,
The Ashes of Waco, by Dick Reavis.