The Bunkus family went to court after Gobzems, appearing on a TV show during the 2018 election campaign, called the murdered lawyer a "bandit".
Initially, the family sued Gobzems for €111,000 in moral damages.
The court decision can be appealed within 20 days.
Initial police reports that they had an idea as to who murdered Bunkus have come to naught as the second anniversary of the murder is drawing near.
The family has announced a €500,000 reward for leads in the rush hour murder, which had many of the hallmarks of a professional hit.
Following the 2018 elections, Gobzems was briefly in the running to become prime minister but failed to muster much support and since then left the KPV LV political party and has become a vocal if peripheral independent Saeima deputy.