People are different. Lots of people get lengthy deployments on oil rigs, in the armed forces, or even high pressure international sales gigs - I don't think these folks love their kids any less than me.
I love my wife and kids loads, but I also love being away from them for brief periods of time (only up to a week in my job). It makes it so much better when I return. We are all wired up differently emotionally - absence truly does make the heart grow fonder in my case.