Heath Ledger’s death didn’t cause any pause for reflection? The mental toll the role took on him?
His insomnia, his means of method acting, and his taking non-prescription drugs against his doctor’s orders are more likely candidates for his demise: https://www.quora.com/Did-his-role-as-the-Joker-drive-Heath-Ledger-to-his-death-Was-the-role-too-challenging-and-harmful-for-the-actors-psyche-or-sanity
There have been objectively more immoral/crazed roles in film history than Ledger’s Joker, yet those actore didn’t go on to overdose on medication (Hannibal Lecter comes to mind). To blame his death on a singular movie role is to ignore the other factors.