Really people get it though you head that yes Apple did some very stupid and bone head things here.
Seeing that we do not know the motive or reason as to why there is no iChat or messaging software on the phone its a little pre-mature to say Apple did a stupid thing here.
I suspect its coming and on top of that what percentage of users use IM on there phone? I for one never use chat and I know Im in the majority there - so given the choice of having a stable 1.0 product or iChat I choose a stable 1.0
(I know Im speculating here that they had to make a choice, something we know they have had to do which is evident by them delaying Leopard to put developers on the iPhone team, we just do not know for certain what plans they put on hold to release later, just that there is stuff being released later).