1. No "favorable conditions" to slavery means Stowe never recognised advantages to slavery. Not only he does not, but he laments it despite those "favorable conditions".

2. Hale didn't excuse the courts; he actively supported their work. That is, until he decided he didn't want to. Later commentators on the trials mark this as the defining moment that helped turn public opinion against the prosecutions.

To sum up my point, read your history.