Because there is a contrast in two cases. The conjunctive adverb "on the other hand" is used to imply contrast. Contrast means the difference between something positive and negative in this case. Using "by the same token" would be wrong: this adverb is used when two things are similar, but in the text one word was given a definition in the dictionary while the other was not.
2. Pay attention! You have to take every word into account. In the first sentence, they explain why the formal (which means official) uniforms are important and later they give an example of law enforcement officers having to wear official clothes. These are interrelated ideas: you can not use contrast conjunctive adverbs here :)
3. You though that there is the same tone in two sentences, but one is positive while the other one is negative. Therefore, "still" is the proper one to use. Here's a similar example: "Tomiris travelled all around the world. Still she missed her hometown." Here, the first sentence implies something objectively nice, while the second sentence includes something sad and therefore negative.
Because there is a contrast in two cases. The conjunctive adverb "on the other hand" is used to imply contrast. Contrast means the difference between something positive and negative in this case. Using "by the same token" would be wrong: this adverb is used when two things are similar, but in the text one word was given a definition in the dictionary while the other was not.
2. Pay attention! You have to take every word into account. In the first sentence, they explain why the formal (which means official) uniforms are important and later they give an example of law enforcement officers having to wear official clothes. These are interrelated ideas: you can not use contrast conjunctive adverbs here :)
3. You though that there is the same tone in two sentences, but one is positive while the other one is negative. Therefore, "still" is the proper one to use. Here's a similar example: "Tomiris travelled all around the world. Still she missed her hometown." Here, the first sentence implies something objectively nice, while the second sentence includes something sad and therefore negative.