A real-world equivalent would be that intelligence agencies would force some secret pin code into every single house alarm so they could get into every single house because, you know, bad people might have house alarms, but it will also make all of us less secure as an end result.
现实生活中一个类似的例子是 情报机构会强行 将某种加密识别码植入每个家居防盗系统 这样他们就可以进入任何一所房子 因为坏人可能装有防盗系统 但这样一来 最后我们自己也变得不那么安全