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To iterate what Adi said....

it's definitely a valid concern.

However, if we look into these genetic predispositions, we may be able to develop effective ways to help people who are susceptable to cheating, drugs, etc. And if there is available and effective help, then there is no "genetic excuse" for detrimental behavior (though, there may be environmental excuses...)

In fact, in all the studies that attempt to associate a disorder with a gene justify their study by explaining how elucidating genetic effects on disorder will lead to the development of more effective therapy.

While virtually no behavior is determined by genes, virtually all behavior is influenced by them. By targeting genes that influence detrimental behavior, we can at least give a genetically predisposed individual a small advantage in avoiding detrimental behavior.