(I will appreciate if you NEVER TELL ANYONE I SAID THIS, not even in confidence. And by "appreciate", I mean that if you ever do, I'll probably either leave the Internet forever or seek some sort of horrible revenge.)
Taken literally, this seems like kind of a fucked up thing to say to a friend. Or a stranger. Anyone really. Why would you say this? Why would you write this in an email and then send it, on purpose, under any circumstance?
scott clearly thought that it was important to get that message out. idk what precisely happened there, but i'll risk a guess that perhaps scott thought that he found a partner in crime, so to speak, and secrecy would help them both. adversary would just use info as is. maybe the biggest thing scott could get in terms of blackmail was flimsy "okay, but you are into this thing too" which won't be effective in all cases, or maybe he didn't even had that
if one person came out and spilled the beans, it'd suggest that there might be more people who didn't