This type of puppet therapy can be useful in treating any number of conditions, where the puppeteer, needs to examine their feelings from a detached perspective , in order to deal with emotions from a safe distance.
It can also be helpful with underlying anger management issues.
Resentment and jealousy, can create unhealthy self loathing. In an effort to rid themselves of these destructive energies the sock puppet gets to say everything the puppeteer wishes to say , without the threat of reprisal from whomever the venting is directed at.

Puppet therapy is also useful in the treatment of emotional detachment issues.
The use of the sock puppet, can also be viewed as cowardice , by many.
Puppeteers who make use of these devices to criticize , and denigrate persons while hiding behind the safety of anonymity really is less than honorable.
The sock monkey by comparison , is much more emotionally balanced with clear purpose and meaning in their lives.
Therefore there is no need of jealousy, or envy.