As written in FC2, such a character (if Lawful) could never get into Baator.

"It requires actually doing evil deeds- thinking unpleasant thoughts is not enough".

And there are a great many ways to "hurt" or "oppress" people, even if the person never desires to kill anybody.

"Not doing evil" generally tends to imply that, to at least a degree, the person is actively avoiding evil acts when the opportunity comes up- given how often they're likely to come up.