My first thought was why would someone want to do this, like they're glamorizing a weapon that causes mass horrors and misery.
But I did just spend hours of the holiday weekend playing a typical video game that's pretty much entirely about shooting people. (And in this case with a sprinkling of sometimes running them through with a machete instead.)
So maybe we already society-wide glamorize weapons and killing, but the nerve gas variety of that is... only unfamiliar?
It's a post from a propmaker community of replicating an iconic prop?
Movies are all about how they make the audience feel, and everyone remembers the creepiness of this particular prop in The Rock. It's awesome that someone replicated it because yeah - it's a very impressive prop because of exactly that reason - it was basically a character itself in them movie, and was an impressively constructed visual piece which was meant to exude menace.
You're doing a weird thing of saying "obviously this is about nerve gas"...no it is first and foremost about a movie, a story, and the emotional narrative it told.
In that it doesn't melt your skin off or melt through protective gear, isn't neon green, isn't stored in silly glass beads, and usually isn't stored in active form at all but rather binary agents that are combined as late as possible. It's nasty stuff no doubt but the movie version that OP recreated is a made up weapon that just happens to use the same name, and they probably recreated it because it's an intentionally cool looking prop, not because they think actual chemical weapons are cool.
But I did just spend hours of the holiday weekend playing a typical video game that's pretty much entirely about shooting people. (And in this case with a sprinkling of sometimes running them through with a machete instead.)
So maybe we already society-wide glamorize weapons and killing, but the nerve gas variety of that is... only unfamiliar?
Or it is innately less-appealing somehow?