Yes it is. Bolivians are very relaxed people and violent crime is extremely rare. Although, travelers should still take the same precautions that they would in a major city in the US. Take common-sense precautions such as not going into unfamiliar areas alone, especially at night.
Petty theft is possible in busy tourist areas such as airports, markets, and other tourist sites, as it is in any city in the world, so be aware of your valuables and don’t leave them unattended. If you believe the Government warnings and Safety warnings in travel guides, they will scare you into never leaving your home. Just use common sense as you would in New York City.