Well obviously, but the converse is also true. The source being illegal doesn't make your use illegal. In the eyes of the law it doesn't matter if something is better or worse, it's the law, it shouldn't be confused with morality. An act is illegal if the law says it is and isn't if it isn't.
Just by being involved as a party does not make you culpable. Murderers are criminals, the murdered, less so.
Choosing to be a party might not make you culpable. You may be an active participant but unaware of the law breaking (being defrauded). Or the law may explicitly state that you can engage with people committing criminal acts and reap the benefits so long as you don't break those laws (or encourage them to be broken) yourself. Some forms of journalism are protected in this way.
Ultimately to have a case you have to state.
1. What law was broken
2. How an action by a party is in violation of that law.
3. That the action actually happened.
The largest problem with this case is not that 3. is in doubt but showing which 1. and 2. they are talking about.
Just by being involved as a party does not make you culpable. Murderers are criminals, the murdered, less so.
Choosing to be a party might not make you culpable. You may be an active participant but unaware of the law breaking (being defrauded). Or the law may explicitly state that you can engage with people committing criminal acts and reap the benefits so long as you don't break those laws (or encourage them to be broken) yourself. Some forms of journalism are protected in this way.
Ultimately to have a case you have to state.
1. What law was broken 2. How an action by a party is in violation of that law. 3. That the action actually happened.
The largest problem with this case is not that 3. is in doubt but showing which 1. and 2. they are talking about.