I do not think it is the same thing at all. I get that many here have suspected the kids have had something to do with her murder since 2011 but trying to blame them - and comparing them to actual murderers who brutally beat a kid with baseball bats - years later when it seems increasingly likely that Lauren was killed by DM, seems like trying to make yourself feel better at the expense of others.
It also bears mentioning that 5N 'did' cooperate to some degree. Much of what is on record wouldn't even exist if they hadn't. JR even had a meeting with the parents (albeit with attorneys present).
The story of their lack of cooperation has more to do with refusing to be questioned multiple times and eventually 'lawyering up', as well as not admitting to a direct role in her disappearance. But if they were truly innocent then what else could they say?