He's telling you about the fact that there's conflict of interest between you and crapple and you tell him an anecdote where some scum of this earth stole money and open source software was involved. Does this really sound like a compelling argument?
Yes. There are bad and good actors on all sides.
Just because something is closed source doesn’t make it bad. And just because something is open doesn’t automatically make it good.
It does however increase the chance that it will be bad, because the average snake that produces closed source software is likely to be motivated by greed, so it has the incentive to milk you as hard as it can without turning you away from products (using lies of course, you can't check anything after all, it's closed shit).
But seeing sibling explanation being downvoted into oblivion makes me think no one is interested in discussing this anyway so why waste breath.
As for the theory of "open source community," see the MyBTGWallet scam. This open source project, recommended by the Bitcoin Gold team, stole $5 million via a single line of code. Being open source isn't much protection really.