What is with refusing to admit slavery is wrong?

[John V]

No. According to the verse, people who kidnap men to sell and/or keep as slaves should be put to death. It makes no such admonition against all slave traders.

I think "if he is found in his hand" indicates otherwise, and a sincere person would not make the verse of no effect just because an intermediary trader was involved.

Yeah, there is, which is why I mentioned them both separately, and I'll note that both of those things are different from kidnapping. As for support, here's a pretty good breakdown from JewishVirtualLibrary.org. I'm not gonna go over the whole thing in detail, but of particular note is the passage from Leviticus 25 that encourages the Israelites to buy bondsmen and bondswomen from other countries.

Do you agree with the first statement on that page: The Hebrew term for slave, eved, is a direct derivation from the Hebrew verb la'avöd ("to work"), thus, the slave in Jewish law is really only a worker or servant.

There's also mention of the fact that Hebrews had to be court-ordered into slavery or volunteer themselves to pay off a debt, and the fact that they are to be let free eventually; alien slaves, on the other hand, served in perpetuity as far as we can tell and didn't have the same bodily rights as Hebrew slaves, either. Given all this information, it stands to reason that non-Hebrew slaves would be more common and more available than Hebrew ones, and that most of them would have been bought from slavers rather than obtained some other way. Most nations with legalized slavery bought the bulk of their slaves, so it's really not an unreasonable claim to state that Israel was probably the same way.

This is speculation. So far we don't know how many foreign slaves were typically in Israel, or how many of those were prisoners of war as opposed to purchased.

The word used can refer to mankind in general (e.g.Gen 7:23), same as the English word.
Sure it can. I'm sure that's what they meant. Care to support that?

I did support it with the citation.

Gen 7
And every living substance was destroyed which was upon the face of the ground, both man, and cattle, and the creeping things, and the fowl of the heaven; and they were destroyed from the earth: and Noah only remained alive, and they that were with him in the ark.

"Man" here clearly refers to women and children as well, as the fold wasn't selective to adult men only. The Hebrew word used here is the same as in the Exodus verse (Strong's number H376).