YABU. Jurassic Park sits perfectly well within the BBFC classification of PG, which is:
" ?PG? Parental Guidance
General viewing, but some scenes may be unsuitable for young children
Unaccompanied children of any age may watch. A ?PG? film should not disturb a child aged around eight or older. However, parents are advised to consider whether the content may upset younger or more sensitive children.
Discrimination
Discriminatory language or behaviour is unlikely to be acceptable unless clearly disapproved of or in an educational or historical context. Discrimination by a character with which children can readily identify is unlikely to be acceptable.
Drugs
References to illegal drugs or drug misuse must be innocuous or carry a suitable anti-drug message.
Horror
Frightening sequences should not be prolonged or intense. Fantasy settings may be a mitigating factor.
Imitable behaviour
No detail of potentially dangerous behaviour which young children are likely to copy. No glamorisation of realistic or easily accessible weapons.
Language
Mild bad language only.
Nudity
Natural nudity, with no sexual context.
Sex
Sexual activity may be implied, but should be discreet and infrequent. Mild sex references and innuendo only.
Theme
Where more serious issues are featured (for example, domestic violence) nothing in their treatment should condone unacceptable behaviour.
Violence
Moderate violence, without detail, may be allowed, if justified by its context (for example, history, comedy or fantasy)."
BBFC PG Rating
It's one of our favourite family films 