The theory of Occam's Razor would tell you that the simplest explanation is usually the correct one.
I encounter this a lot. Yet it has an important keyword there USUALLY. That is not the same as always. ;)
If you are going to suggest another then you have to show me why it is more likely to be true.
I agree with this. Yet we must be open to what is presented rather than immediately defensive. Like I said Skepticism is good. Stubborness is not. ;)
It still requires evidence, yet there are those that can get fixated on their view and claim to be open... yet they will do whatever they can to ignore information that challenges a current belief. Is that really skepticism?
I am not claiming this is you by the way.
As far as considering people who have focused on an area and believing them, it depends on their history of accuracy.
Yet that is still just a probability. It is a high probability like I said (assuming they've got a history of being accurate) yet that also does not mean they may not be wrong.
In addition, it is not always 100% right, and 100% wrong. People can also be partially right about some details and wrong about others.