For murders and serious violent crimes like stabbings and robber/assaults resulting in major injuries, or for serious thefts, in a country like Canada or the U.S. i'd believe the numbers are. Very few people in these countries, where perception of police as useful more or less exists, would fail to report such crimes.
On the other hand, just to showcase a counterpoint, in countries like the one I live in (Mexico) even violent crimes and major thefts often don't go reported simply because in many parts, police are considered so useless (or even sometimes collusive with criminals and thus counterporductive) that even for serious things, they're not contacted unless absolutely necessary.
Even with these tendencies however, you'd be surprised how often people do go through the formality of filing a report just in case it turns up a result, particularly for murders and kidnappings, where desperation obligates them.
For murders and serious violent crimes like stabbings and robber/assaults resulting in major injuries, or for serious thefts, in a country like Canada or the U.S. i'd believe the numbers are. Very few people in these countries, where perception of police as useful more or less exists, would fail to report such crimes.
On the other hand, just to showcase a counterpoint, in countries like the one I live in (Mexico) even violent crimes and major thefts often don't go reported simply because in many parts, police are considered so useless (or even sometimes collusive with criminals and thus counterporductive) that even for serious things, they're not contacted unless absolutely necessary.
Even with these tendencies however, you'd be surprised how often people do go through the formality of filing a report just in case it turns up a result, particularly for murders and kidnappings, where desperation obligates them.