Easy, some folks write Haskell or Scala in Rust, because it allows them to reach a wider mindshare. So they write their monadic and effects frameworks in Rust

Easy, some folks write Haskell or Scala in Rust, because it allows them to reach a wider mindshare. So they write their monadic and effects frameworks in Rust instead, and use unsafe to mark methods that might be dangerous, regardless of related to possible memory corruption or not.