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There are no virtues objects. However, the object of meditation is to bring the mind to a neutral object such as breath hence no unwholesome thoughts arise.
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You might want to consult Vitakkasanthana Sutta: The Removal of Distracting Thoughts https://www.accesstoinsight.org/tipitaka/mn/mn.020.soma.html
It explains how one deals with unwholesome thoughts in several ways and 'Reorienting Thoughts Towards Virtuous Object' is one of those ways.