You can send them whatever you like, but declaring that further contact will be "evidence of the outrageous behavior" doesn't automatically make it so.
If you move out and your roommates get evicted, your landlord can come after you for rent. If you move out it is also possible that your roommates will sue you for your share of the rent.
If you do move out, and your lease has a provision for automatic renewal or extension, make sure to notify your landlord in writing and in a manner consistent with any terms in the lease that you will not be a tenant for any renewal or extension of the current lease.

