It's like voter fraud.
I agree with the concept that trans women shouldn't take athletic opportunities from biological women...but when is that happening? Just b/c they compete doesn't mean they get scholarships that would have otherwise gone to a biological woman. Find an example in Arizona of when someone has been wronged by the current policy and maybe I'll change my mind.
Maybe it will be a problem some day. Right now, it's just an attempt to demonize. Remember when gay marriage would totally ruin the institution of marriage? At this point, most people that are socially liberal are skeptical of the true intent here, and rightfully so.
...and to the party that still denies climate change, don't talk to me about being proactive.