That is exactly why kids shouldn't be forced. But also why they should communicate with their parent about why they are not coming. It may have been that had things been brought out in the open, and had you been taken seriously, your dad would have gotten treatment for his depression and dealt with his issues, and then you could have had a better relationship.
I'm 25 now, and it still hasn't gone away. We email sometimes, but whenever he asks me to come visit, bam, that resentment slides right up. Nothing has changed either - except, by now, he's clinically depressed, and still we clash with our philosophy. And, still, when I say I don't want to visit, it's like falling on deaf ears. The only difference is that, now, no one is forcing me to go. Thus, I don't go, and we only exchange the obligatory birthday/xmas emails. All from his side, too, as I simply don't care to make the effort.
It's sad on the one hand. On the other, I had a great father figure for the first 5 years (my grandfather). And then I lucked out and got a wonderful step dad. Mainly, it's just sad for my dad. But, I can't overcome the resentment to see him and make nice.