If you go for DW you go for a high TPS spec and not for a utility spec. So you would have points in Incite. After taking alle core points in the prot tree you have 10 free points to spend. At this point your tree would look at least like this: http://wowtal.com/#k=f-SDumi.aei.warrior.
Even at this point you will have at least 1 point in Incite if you either skip gag order (as said before - TPS specs are not utility focussed and Gag Order is a very situational talent at content where TPS is really important - meaning raids), Thunderstruck or T&B or improved Rend. Chances are high that at least 2 of those talents would be skipped (even if I only show one skiped so it's more like a worse case szenario).
You need only 8 points for getting full DW. So you have 2 free points after that. To assume that those 2 points would be used for more utility is just not realitstic. (If you think about using them on Blood Craze - it's not worth it as was shown in another post. Finishing the encounter earlier helps your healers much more than this little and uncontroled heals.)
But if you want to build a true single target DPS spec, you would pass on another utility or AoE talent to max Incite even with the 31 points you need to put into prot. If you do that, you can spend those points easily on Cruelty. Both talents are much better than all this other talents for the focus of the spec (single target TPS) so there is no point in neglecting them.