Boston Dynamics and five other robotics companies have signed an open letter saying what many of us were already nervously hoping for anyway: Let’s not weaponize general-purpose robots.

The six leading tech firms — including Agility Robotics, ANYbotics, Clearpath Robotics, Open Robotics and Unitree — say advanced robots could result in huge benefits in our work and home lives but that they may also be used for nefarious purposes.