'The existence' doesn't expect us to behave in a particular manner. It gives us freedom to make our own choices. But the consequences of the choices we make are subject to the natural principles enumerated in the Bhagavad Gita. The same is reflected when Krishna says, "Thus, I have explained to you this knowledge that is more secret than all secrets. Ponder over it deeply, and then do as you wish" (18.63). This verse clearly dispels the notion that Krishna is compelling Arjun to fight. Instead, at the end of the Gita Krishna gave him the freedom to choose. 

This verse comes in the background of Krishna telling Arjun, "Because of 𝙖𝙝𝙖𝙣𝙠𝙖𝙖𝙧 if you think 'I will not fight,' your resolution will be in vain. Your nature will compel you to fight" (18.59). Another aspect is that Krishna always told us to drop our desires and wishes, but here he says do as you wish. These aspects need to be kept in mind to understand this verse. 

Firstly, 𝙖𝙝𝙖𝙣𝙠𝙖𝙖𝙧 (𝙖𝙝𝙖𝙢-𝙠𝙖𝙧𝙩𝙖 or I am doer) is responsible for all our behaviours and desires. While choosing, we can make a choice in tune with existence which is nothing but accepting anything that comes our way or we can choose out of 𝙖𝙝𝙖𝙣𝙠𝙖𝙖𝙧. When we choose out of 𝙖𝙝𝙖𝙣𝙠𝙖𝙖𝙧, Krishna clarified that our resolution would be in vain. 

Secondly, these verses wade into the delicate debate over free will versus determinism which remains a major focus of philosophical debate. Free will is about our ability to choose our actions whereas determinism states that these actions are predetermined by external factors. One inference is that we have the freedom to perform 𝙠𝙖𝙧𝙢𝙖 in the present moment but no right over its results (𝙠𝙖𝙧𝙢𝙖-𝙥𝙝𝙖𝙡) which comes in the future and is determined by so many factors apart from our efforts (2.47). 

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