There are many reasons. You might consent because you really believe you've done due diligence and you want a chance to demonstrate that you've done the best you can with imperfect information. You might consent because it can be very difficult for companies to continue to operate in environments where the local community is not supporting their operations. You would have an opportunity for informal mediation, and whoever the counsellor is becomes really important to its success.
On June 1st, 2009. See this statement in context.