PHILADELPHIA — A school bus aide in suburban Lansdale choked a 6-year-old boy, saying he needed to teach the child a lesson, prosecutors in Montgomery County said Thursday. Macarthur Wilson, 72, was charged with strangulation, simple assault and endangering the welfare of a child. The episode allegedly took place Oct. 16 as he rode a North Penn School District bus with the victim. Wilson was released on $5,000 unsecured bail. He did not immediately respond to a request for comment. Investigators first learned of the alleged assault from the victim’s father, who said his son had come home “visi…