Maybe it doesn't have to be forced, but mods and helpers can see if you skipped or actually went through the page or video of rules. Then it will look better on yourself if you actually did it.As much as that would be great, There will be that kid who thinks he knows how to use the forums then immediately break the rules.
As a side bones if it is forced then it would make people create less alts as they would have to sit through the walkthrough for every account they make.