In the same way that it's worse to shoot someone with an actual gun than to threaten to shoot them with a Nerf gun.
The negative network effects on other scammers are also nice.
An "honest cryptolocker" helps support more cryptolocker use, as people trust that if they pay the criminal they'll get their stuff
If dishonest ones were the norm, than maybe cryptolocking would cannibalize itself as nobody would pay since they know its useless. So in a sense the dishonest one while having less ethical intention has more ethical results. But only at scale. Hmmm.