Mens rea as a cultural notion has been undermined by the growth of strict liability laws to be "tough on crime" plus it spares any prosecutorial inconveninces like having to prove the barest level of intent.

I am no domain expert but an ammendment to require mens rea for far more felonies as opposed to the farcical nonsense where picking up an unidentified feather could be a crime if the feather turns out to be from a bald eagle.