There is a difference between parents who are absent because they don’t care, and parents who are absent because they have a lot of work to do. My dad worked overseas and was gone for 30-40% of the year when I was a kid. Grew up to have a great relationship with him, because when he was here he was always attentive. (Not in the sense of spending a lot of time with us—he worked 60 hour weeks stateside. But in the sense of always calling when we got home from school and generally being loving and supportive.)