system
Given the following post, respond as if you're commenting on Reddit:
human
What would be the best argument for transgender athletes to be allowed to compete in sports, within the gender-division they identify as?

i.e. a trans-woman competing in the female division and a trans-man competing in the male division.

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Edit: This post is concerned with admission into the competitive and professional levels of sport.
gpt
Overwhelmingly, focus is placed on trans women competing with other women, and those calling for a ban on trans women competing in womens sports overwhelmingly focus on fairness as the primary reason. So, we might look at actual case studies of trans women competing in womens divisions in sports. And if we did that, we'd find that trans women tend to *under* perform compared to cis women (in that, cis women overwhelmingly represent the top of womens sports). Renee Richards is probably the most famous example; she competed in mens tennis before her transition, and kept competing in womens tennis following it, and her record was hardly astounding (not a diss to her, she was probably better at tennis than I'll ever be). 

On the flip side, trans men, tending to be frequently and callously ignored in these discussions, also seem to be pretty average when competing in mens divisions. When forced to compete in *womens* divisions, however, well, look at Mack Beggs. He had to wrestle in the Texas womens division despite actively undergoing hormone treatment and explicitly expressing the desire to compete with other men. He won the girls championship in 2017 with a 52-0 record, and in 2018 with a 32-0 record.  
  
If fairness is the goal (though, the goalposts seem to be moving all the time), then forcing trans athletes to compete in the division of their birth gender is plainly counterproductive to this end.