Not sure where the impression that best diving is out of La Paz?
We were in Cabo first week in November, and did three dive days. First was "local" diving at Pelican Rock and Land's End - two very different dives, with the second one starting out in the Sea of Cortez and ending in the Pacific Ocean (via a surging swim-through onto a wreck site).
Second dive day was driving to La Paz, for a Whale Shark snorkel (one, maybe two - but we had done Isla Mujeres with dozens) and then an endurance-challenging boat ride to do a one tanker with the Sea Lions.
Third dive day was two tanks on The Corridor that everything we expected for Pacific Ocean diving.
All three trips arranged and lead through Manta Scuba in Cabo.
In terms of Travel Advisories, we were there the week before the cartel issue that received so much media attention, and due to the positive impression that the entire Cabo experience left with us, we have already booked the same week for this year.
So long as you don't do anything that you know is questionable, you won't end up accordingly.
PM me if you need anything else.