Point of alien disguises?

My Sims 4 Legacy Challenge Gen. 3 Heir was abducted. He had a set of twins, a boy and a girl. These two were very nervous and felt way more comfortable in disguise, until their father's brother took them out to Alien Night at the bar to meet others who looked like them. Problem was the twins were a lovely shade of lavender, whereas the others were either green or blue. His 'plan' worked in that the twins didn't use their disguises so much after a few trips to said bar on the designated night.

I don't see a point in the disguise, myself. To me it's just about as useful as the 'celebrity disguise' which never worked for my celebrity Sim. LOL His fans knew him, no matter what he wore. ;)