I would agree with you. In the army, we use BFAs at the end of our rifles when we're shooting blank ammunition. It also shows that the rifle is safe at the time. Using a brightly coloured tip on an airsoft seems a reasonable compromise to be made, although if somebody is intent on using a replica airsoft firearm in a nefarious way, obviously they could spray paint the brightly coloured tip on that.
There's nothing that law-abiding, fun-loving airsoft people can really do about people who are determined to use airsoft guns for bad purposes. Is that correct?