Nobody is free of self-interest, and thus it is a good idea not to trust anybody blindly.
At the same time, I trust government scientists more then corporate ones. The person working for the government at least in theory is trying to find the best possible description of reality and their reputation and career are somewhat staked on being right. The guy working for a corporation has more to gain by producing a convincing answer that supports the corporations posistion.
Or to put it more directly. The government scientists might be wrong, but they are not usually intentionally deceptive, corporate ones often are.
Jay