“أُرِيدَ” is a past passive verb: the intended action is mentioned without naming its agent. “أَرَادَ” is active; “رَبُّهُمْ” is its subject and “رَشَدًا” its object.
An unexpressed agent does not necessarily indicate ignorance about who acted. The speaker might want to foreground the event, be concise, or select an expression suited to the occasion. In this Qur’anic passage, the contrast between evil and right guidance makes the rhetorical choice significant.
The key distinction is between syntactic form and rhetorical purpose: one is identified through grammar, while the other is judged through context.