If you want to have an honest discussion about chemical weapons you shouldn't be including Agent Orange or DU rounds.
Neither are truly chemical weapons, though they both have or may have long term consequences from their use they don't fall into the same realm as something like Sarin, VX, or even Mustard or Chlorine Gas.
I think I was clear about that, saying that the US has long abandoned the use of more direct 'chemical weapons' while noting other weapons we have used with somewhat similar issues. If I show you the massive deformities in Vietnam from our weapons, they clearly rasie a lot of the same issues as chsemical weapons; not all. An 'honest discussion' will include both weapons like Sarin-based weapons (and bioligical weapons), as well as other weapons that aren't simply 'gunpowder' based, such as Agent Orange and DU rounds.
There's nothing that's not an honest conversation there - they aren't being equated, they are just both up for discussion; the poll specifically includes an option to treat them apart.
You are welcome to say anything you like about each.
Some will see the similarities more storngly, others will not, the point is, in discussing chemical weapons, it's accurate to note that while the US has not used weapons like Sarin in combat (since I think at least WWI, when I think both sides did, I'm not sure about the US use), it's fair to note some of the more controversial weapons we have used, for discussion if people want. If you don't, state that's your position (preferably with your reason) and ignore those weapons.
The main point is not those other weapons, it's the question about the chemical weapons - while the US has not used them, we also do not face any 'existential threat' since the cold war and nuclear weapons, which are not relevant to this issue of chemical weapons. We've told other countries that we demand their governements be willing to be defeated, even to the point of putting the leaders' lives at risk, while restraining themselves from using weapons they might feel could save their government from defeat - but will we apply the same thing to our own government, if we did face such an existential threat? Would we allow a foreign enemy to military defeat our country and remove if not kill our leaders, while restraining ourselves from the use of chemical weapons if they turn the tide of war?
It's something we demand - but will we do the same?
It seems to me that most Americans might well say that in that situation, we'd be willing to have them used to win the war - but that we don't recognize others' right to do so.
There's not much to do with that if true - it's nice to be the military leader and not have to face the issue or be consistent - but I'm just verifying if that's how people feel.