Many of my non-sudanese readers asked me the same question " If the Sudanese government can't stop the conflict in Darfur then why on earth are they rejecting the UN troops".
I answered a couple of them but my answer was half satisfying.
Here you go, this is a very good answer from Sara Flounders who travelled to Sudan after the bombing of El Shifa pharamceutical plant in 1998.
She is very anti-west and anti-US but her answer is similar to that of the Sudanese government when they were asked to accept the UN intervention.
http://globalresearch.ca/index.php?context=va&aid=3235