Why would Newton's 2nd law be meaningless here?

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SUMMARY

The discussion centers on the implications of Newton's second law in the context of an isolated system. It asserts that if an isolated body accelerates, the validity of Newton's second law becomes questionable unless there is an independent measurement to confirm the system's isolation. The reference to page 60 of "K&K" highlights the necessity of verifying isolation to determine whether the laws of physics are being violated or if the isolation was improperly conducted. The conversation emphasizes the importance of independent verification in physics experiments.

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As the example says, if the object starts to accelerate you have no way of telling whether or not it is actually isolated unless you can find something else to measure. Is the system isolated and the laws of physics broken? Or is it that you haven't isolated the system well? You don't know! You need an independent way of telling.
 
Thanks Drakkith...I think I might've misinterpreted what it was saying a bit