Lets put it a slightly different way, lets say you make safes for protecting valuables. And you make your safe so that any attempt to break into it without the combination would destroy the contents, or make it so that the only way to open it, like cutting into the steel with a torch, would destroy the contents.

The FBI can (and does) hire locksmiths and safe crackers to get into safes where they believe there is valuable information inside, but they don't compel the manufacturer of the safe to create a capability of bypassing its safeguards, but if they did criminals would seek it out so they could rob those safes, and customers would stop buying that safe because they knew criminals could probably get their hands on the same tools the government could to break into and defeat its countermeasures.

So having the government able to order a safe maker to build a safe that can be broken into, the safe maker loses customers and business because their customers don't want a safe that can be broken into, they want one that protects their valuables from everyone.