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Utilitarianism is the premise that the total happiness of all sapient beings is important which includes minorities.
Utilitarianists tend to value liberty because they know that there is no such thing as omnipotent rule and people cannot be trusted with too much power, they also recognise that happiness is difficult to define and that liberty and justice are the most reliable guides to keeping happiness high.
As a result a tyranny of the majority is considerred immoral on the basis that the minority is sufferring too much to justify the small increase in happiness amongst the majority and also because the breach of liberty will cause instability and further sufferring in the future.