Telepathy as as normal for Betazoids as hearing is for humans and we don't switch our hearing off when people start talking. If an offworder chooses to go to Betazoid why should they change what is their biological norm for them?
I just assumed that Betazoids use telepathy when speaking to each other, but talk to offworlders with normal verbal communication. That would be the respectful thing to do, wouldn't it?
IIRC, Betazed's supposed to be a pleasant place which respects individual rights - aliens included. So a Betazoid would not use telepathy with any alien who didn't already practice it. Forcing telepathy on someone would be like forcing a mind meld...and we all know how repugnant that would be.
I mean, in TNG's "The Drumhead", there was a prosecuting attorney who was a full Betazoid - yet he never used his powers to openly read Simon Tarses' thoughts when Tarses was on the stand...yes, he sensed deception on Tarses' part, but that could be simply taking advantage of Tarses' verbal cues and obvious nervousness. Which any prosecutor would rightly do.
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