I’d way rather treat all employees fairly and fade a <1% chance of a false accusation than to treat employees unequally and cut that chance in half.
You're not saving yourself from any false accusations. The people you have closed door sessions can accuse you of SA regardless if you're attracted to them.
It's a lot larger than 1%< depending on how long your career is and how many individuals you encounter over its course.
It means that it's far less likely that you could do so unobserved, which makes it harder to explain away the lack of observations for a false claim.
Also, it sends a message that might be a deterrent to a false claim.
Had so many problems in one office that they re-architected it so every office had (at least) a large window. Complaints of hanky-panky dropped to zero.