What kind of irresponsible parents let a young girl go on a trip alone with a boy like that Gabby Petito girl?

This is HIGHLY inappropriate. You are basically saying okay, bye, enjoy having him have sex with you while you go cross country... and then you're far away from any help if he does something like this.
What kind of irresponsible parents let a young girl go on a trip alone with a boy like that Gabby Petito girl?
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