Any lawyer worth his salt would know that a man is innocent until proven guilty. The article, unreliable as it is (it’s Wikipedia after all), says that the charges did not stick. Athanasius had many enemies, especially among the Arians. The Arians were capable of their own brand of slander. None of the charges were proven. Besides, this is hardly a matter of scholarly consensus; the only authors Wikipedia cites in this matter (and passes off as fact) are Barnes (1981) and Rubenstein (1999). Since you admit you’re not a history expert, you would have been obligated to seek out multiple sources instead of a Wikipedia article before branding a saint as evil.
If you wanted to pick on a saint, you would have had better chances with St. Cyril of Alexandria, St. Jerome, or even St. Augustine. Cyril is especially noteworthy for having some indirect responsibility for the violent death of the renowned pagan teacher Hypatia at Christian hands.
You picked the wrong saint to attack.