It's all a matter of perspective, isn't it?
For the 1st century Jews, Saul was the good guy, Paul was the Apostate.
For the 1st century Christians, Saul was the bad guy, Paul was the anointed apostle.
In line with Sir82's comment, the "perspective" is human only!! While Saul was out persecuting Christians, Jesus has already determined him to be not only acceptable, but a key member of his team. The lesson to be learned is that we, as humans, should not be seeking to judge others' hearts and determine who is and who is not apostate based upon our limited knowledge.
As Paul' case documents, one man's apostate may be Jesus' chosen and annointed one.