It was kind of dangerous, yes, but it was invented for playing games.

[Mostly. He's pretty sure Kaiba Corp did originally make military stuff, but Seto just really likes holograms. And who can blame him, honestly; Atem's not complaining about that.

But the idea of this being a virtual world has some appeal, even if it may not be for something as fun as games. At least it would make sense, then, and be something he has some experience with, and have a way out.]

However, it could be used for other purposes, and it would be an easy explanation for all of this.

[An easy explanation, but despite his wishful thinking probably not the correct one.]