Original sentence: It is a very popular and well regarded film, not only for its stylised violence, but for its themes of honor, love and friendship, which, coupled with the religious motif of salvation (not uncommon in the heroic bloodshed genre) is used to evoke powerful emotions
Edited sentence: It is a very popular and well regarded film, not only for its stylised violence, but for its themes of honor, love and friendship, which, coupled with the religious motif of salvation (not uncommon in the heroic bloodshed genre) is used to evoke powerful emotions (though a guilt-ridden hitman with a conscience would hardly be in such as job in the first place)