Because you're defending a rule with no justification whatsoever, isn't it obvious? You're pushing a rule (and call those who violate it cheaters), just because it's in the book with now explanation why it is there and what for. You see, there are fair and just rules and laws and unfair, unjust, tyrannical ones. There are examples from TT: hidden serves and same color rubbers are forbidden, because the sport turns into gambling otherwise. You'd have to guess what's flying at you with no way to know. These are good rules. VOC are indeed toxic in some environments, with enough care they cause no harm, but there's at least something to justify their ban.
There's nothing against boosters: nontoxic, nonvolatile, very viscous, or just mineral oils used everyday in cosmetics. And on top of that rubber cartel uses them routinely in production.
No, I told you there no reason for this line that you wanted "to draw somewhere" and you volunteered to come up with one. When what you came up with—very contrived per se— didn't stand up against scrutiny, you're trying to weasel out from this, instead of just admitting that there's no reason against boosters and you're advocating a hypocritical, unjust and unfair rule, which allows rubber cartel to do exactly the same, what it forbids for players.
There can be such asymmetry in, say, how states treat drugs, but the harm for individuals and societies is pretty well-known and well described. These laws are well justified, but this 2.4.7 cannot possibly be.