In Jain Dharma, the ideal is to never intentionally harm any जीव. Ahimsa is the highest principle.

However, in practical worldly life, complete total non-harm is extremely difficult for householders, because even walking, cooking, farming, or cleaning can involve some injury to very subtle life forms. So Jainism distinguishes between:

• Intentional harm: strongly rejected.
• Unavoidable, minimal harm in daily life: recognized, but should be reduced with care, restraint, and awareness.

For a Jain person:

• Monks and nuns follow the strictest form of non-violence.
• Householders follow a lesser but sincere form, avoiding violence as much as possible.

So the answer is:

A Jain should never knowingly or willingly harm life, but in worldly existence some minimal, unintended harm may occur. The goal is always to reduce it and live with compassion and restraint.