The lustful nature and greed of the wealth bring oneself to disobedient and not giving zakat. Lust caused a person to love his wealth and did not want to donate it even a little.
Lust scares a person for having fears of being poor, fears of his wealth diminished, and fear of his wealth too hard to recover.
Lust has a duty to invite people to mischief and crime. Lusts within a person are always trying to get into the act of denying God.
Therefore we should always be aware of the whisper of the evil-lust so as not to be affected by it and ignoring the obligation of giving zakat.