I disagree. IMHO Criminal sexual predators generally would not take into consideration the legal consequences of their assaults when planning them. IMHO predatory sexual offenders often and mistakenly believe that they will never be caught hence the legal consequences are of no importance to them.
I doubt that someone from Canada would go to the USA to abduct, assault, and murder two young girls. Sentencing in Canada is far more lenient so, given the consequences, it seems unlikely that a suspect would opt for harsher sentencing for the same crime.