I go into the ocean without any concern. A great white working well inshore for a food supply can be a concern though. Depends on clarity of the water etc. Apparently sharks do not usually attack people intentionally. The noise we make swimming sounds like something in distress to them. So they probably have a look quite often.

Sometimes just bite to get a taste of what they suspect could be desirable prey. If hungry.

The bull shark that went way up the fresh water river in New Jersey decades ago and killed some people swimming. Is one specis known for aggression.

Some of their negative behaviors towards humans may be based on the lack of adequate available normal food supplies. In a given area. This particular great white has travelled fairly fast up from Florida was reported.