Ah yes, because as we all know, the best way to prevent a robbery is to preemptively burn down the whole building. Good luck stealing from me once all my belongings have been turned to ash!
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To be a bit more charitable, it may true that in some cases, getting hacked is worse than just having your account deleted. I'd posit this is the case for a small minority of users, especially when the overall chance of being hacked is still far from 100%.
By the way, what about accounts that do have two-factor authentication enabled? Are those exempted?
If Google wants to delete inactive accounts, that's their prerogative, but don't hide behind some security argument.