At the risk of making a bad analogy, a car can be used by someone to go on a rampage and mow down hundreds of people. If that happened you can be sure that someone, somewhere would suggest that the auto manufacturers have a responsibility to stop this kind of thing from happening again by making a "kill switch" available to police that can be used to stop the vehicle remotely.
Another bad analogy would be using a hammer to kill someone.
Clearly there is a fuzzy line there somewhere. I am not saying that companies have no responsibility in keeping their products from being used in bad ways by bad people, but I do think it is important not to only look at the bad thing and say that companies need to stop that bad thing from happening at all costs.