why is it merely voluntary for physicians to inform patients about a health care intervention [aspirin] that could save untold billions in taxpayer £££ each year?

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So the question remains: given the evidence we have, why is it merely voluntary for physicians to inform their patients about a health care intervention that could not only help them, but also save untold billions in taxpayer £££ each year?

Since 2010 I've taken a baby aspirin a day. Google: Rothwell aspirin,  Here is why...