Unlike so much other relatively new law, this satisfies mens rea, "the guilty mind" (https://en.wikipedia.org/wiki/Mens_rea) so I can't say I have problems with it. Heck, it echoes a favorite Proverb, the start of 28:
The wicked flee when no man pursueth: but the righteous are bold as a lion.
If I were to realize a (now very much ex-)friend had just maimed and murdered a bunch of people, my first thought would not be to dispose of evidence.