I think it depends on the person and the situation. It could be a genuine response meaning... I believe this to be this way - but I am not 100% positive on it.
OR it could be someone lying or persuading someone a certain way, but leaving the door open just a crack so they can back out of actually lying to someone.
Thus it could be genuine or manipulative, it really depends on the person and/or the circumstance.
- Best Wishes