A mugging is performed on account of the volitional action of others.
Are you suggesting that one man's kamma gives rise as a proximite cause to another man's kamma?
If so, where is the personal responsibility and moral agency for the mugger in that scenario?
Can a mugger's kamma be a victim's vipaka? Can separate streams of kamma and vipaka intermingle and crossover in such a way?
"Do not force others, including children, by any means whatsoever, to adopt your views, whether by authority, threat, money, propaganda, or even education." - Ven. Thich Nhat Hanh
"The uprooting of identity is seen by the noble ones as pleasurable; but this contradicts what the whole world sees." (Snp 3.12)
"To argue with a person who has renounced the use of reason is like administering medicine to the dead" - Thomas Paine