The Islamic Republic of Pakistan is the successor state of Harappa. The Secular Republic of India is further away genetically AND religiously (insofar as religion being the only "proxy" that one may deploy for "culture", as nebulous a term as that is in this particular context).
As far as we know, Harappans ate plenty of meat, including plenty of beef.
Beef abstinence (and meat abstinence) is a belief imported from Vedic philosophy, not from pre-existing Harappan cultural practice. There is ample evidence to suggest that the deities worshipped in Harappa were simply appropriated by Vedic culture. I am not sure where you get this hopium that modern hindus are somehow "adherents" of ancient Harappan religion.
Any vedic/sanskrit texts that you can show us from Harappan archives?
Regarding beef consumption:
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The research offers insights into the food patterns of ancient South Asia by using lipid residue analysis.
www.scroll.in
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You are as "culturally foreign" to the Harappans as we are. Just because you borrowed their deity and still cursed them as Mleccha, it doesn't give you authority to appropriate them when it suits you.
Aryans are not the earliest or only source of Indian civilisation, suggests new research on genetic ancestry.
www.bbc.co.uk