You are not serious in these things.

你们对这些事情都不认真。

youdao

I suppose you are not serious, are you?

我想这事你不是当真的，是吗？

youdao

We consider you are not serious, (a. Are; B. aren't) you?

我们认为你不认真，不是吗？

youdao

If you have that balance, you are not serious enough about your startup.

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With that said, what you wrote are not serious policy suggestion but bumper sticker slogans.

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The basic problem with this argument is that the two plans are not mutually exclusive to begin with-that is, not if you are truly serious about defending America, our allies and our forces overseas against ballistic missile attack.

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