Roads? NGOs have jeeps these days.
Doctors Without Borders, which functions under extreme conditions, withdrew because it cited the violence and the inability of the current government to protect its workers.
That's quite something for an organization that works in war zones.
That also says nothing about the first item in the list: the safety of the respondents. NGO workers getting stuck on bad roads would not adversely affect the safety of people living in the area who were replying to questions. Being shot at for collaborating with Westerners would.