The Jedi were fools to leave Shmi a slave on Tattooine.
Because they told a little boy that he needed to leave his mother behind and ignore her welfare, she later died a horrible death on a backward planet, leaving her son with overwhelming guilt that turned to anger and was a major factor in his becoming a Sith.
So why DID those fools leave a woman who'd borne a Force prodigy in slavery? Why didn't they come back, buy her freedom, and settle her somewhere she'd be safe and comfortable (like Naboo), and where they could see if she was going to give birth to any more potential Jedi? Why didn't they tell Anakin that they'd made sure his mother was safe, because Jedi always rescue the innocent, and he didn't need to worry about her or feel guilty? Couldn't they spare a few minutes of Jedi time and a few credits out of their treasury, to do a good deed for someone who'd helped them?
And why oh why didn't they test the midichlorian count of a woman who'd given virgin birth to a Force prodigy? Sure, she was "too old to begin the training" if anyone was, but she may have had abilities that were of use to them, or to someone.
“Seventy-seven courses and a regicide, never a wedding like it!