Isn't the only reason for this, nefarious?

What purpose does this serve except for something bad.

Is there any justifiable reason?

yes but is the person they're using it on good or bad, making the purpose something good? killing is bad, but if I'm a hitman that only takes contracts to kill bad people, does that make me a good guy?

I think problem with this is it is on amazon for anyone to buy.

The pagers were targeted. They manipulated the supply chain to get them into the hands of the bad guys.

This USB connector is general public. Everyone could have one.