How he got the fruit really had no bearing on the state of mind he cultivated within himself that resulted in his wantin to eat it. The Bible puts the blame on him in Isaiah, and as Deuteronomy 24:16 and Jeremiah 31:30 say, every man dies for his own sin.
I certainly agree that it was sinful for him to accept the fruit and eat it, just as it was sinful for Eve to take it and eat it.
There’s a lot going on in that brief few verses in Genesis. Both of them sinned, in what they did and what they failed to do. There’s much to learn, to apply to our own lives, regarding what WE do and what WE fail to do.