It is always a good idea to disambiguate when it is necessary, but you need to take each instance on its own merits. For #1 it is unnecessary to clarify, since this is an idiom. #2 is not idiomatic and is confusing; it should be recast.
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Debpriya DeSentence #1 can mean either that I treated him like a king would treat him or that I treated him like I would treat a king.The expected interpretation here is "like I would treat a king".
Debpriya De2. "I defeated him like a soldier."This is too ambiguous to be useful. Besides, it's a bit anomalous under either