Have you even considered that such mental tactics might not be effective, because just as such mental manipulation would be available for the side of 'good', it would be available to the side of 'bad'?
It would not be so hard to arrange things such that a base is entered from a portal and absolutely no indication of where it is is conferred by mental scrying
Or standard memory wipes so that the memory of where the base is is literally deleted and wiped making recovery impossible. Or memory alterations that suggest a different location that is actually a trap. Or the act of mental invasion setting loose a chain of events that kills the person or maybe lashes out at the person attacking the mind.
There are enough scenarios one can envision that would both make the world a much much unpalatable place as well as working against mind reading being a 100% magic godsend.
So why bother.
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There is no shame in not knowing; the shame lies in not finding out