Voting for an election for a person who masturbates

It was announced today that a man arrived to vote at the polling station fifteen minutes before his wife's funeral, because of the commandment "and do whatever you are told":
https://www.bhol.co.il/news/1457350.
Someone responded to him that this was a mistake, since according to Halacha: "The masturbator is exempt from all the mitzvot, such as prayer, reciting the Shema, putting on tefillin, studying Torah, and more. And he is not permitted to be strict with himself and fulfill them."
Is this true? From a legal perspective, would it have been better for him not to vote? Assuming that there is a mitzvah in voting, is he fulfilling a mitzvah?