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The best argument against that argument is to point out the fact that in order to make it one has to expand and even twist the definition of "pedophilia", to such degree that if valid, then the definition itself would cover activities and interest beyond what could be harmful. At that point, any objection would be a matter of taste, and taste is subjective and ultimately doesn't matter.
So, if they're gonna argue that "lolicon is pedophilia" they're expanding the definition beyond what could ve useful, and diminishing the meaning of it, unironically making it unsafer for children because the definition of something that may harm them has been watered down.
Ultimately, it's just art, protected by every single sensible application of freedom of expression.