i'm assuming he goes to kill one of his first victims and some chick witnesses it and thought it was cool and joined him
thats what happened.
Some girl on TV started crying and bitching because she said "I WANTED AN ESCALADE NOT THIS AND I WANTED IT TOMORROW NOT NOW YOU'RE SO MEAN TO ME I HATE YOU MOM" so the man went apestuff and killed that bitchy girl and the girls like "woah, did you just kill chloe?" and he says "yes" and she says "awwweesomee!"
Hopefully all of the pricks that do this stuff/like this stuff see this movie and loving change their minds.