The human brain is just really bad at evaluating risk, especially over long periods of time. A lot of people are wanted overseas for years or even decades without anything happening, which makes it hard to maintain the mindset of being at risk without falling back to "eh, I've been fine this long"; a lot of them do foreign travel anyway and get away with it, which makes it hard to not fall into "what's one more vacation to a extradition-friendly country".