Within man boils the blood of Cain, who murdered his own brother out of jealousy and resentment. Rejection by nature breeds hatred, towards fate, towards God, towards others. With hatred comes the desire for Revenge, turning men to tarantulas.
It’s hard not to sympathise with Stiles. We’ve all been there at one point or the other. To have the most despicable fantasies of the suffering we would invoke on those who we believe have wronged us.
It is easy to look outwards for reasons to follow the path of destruction. It’s hard to look inwards for peace.