Lynching inactives is not a great idea on Day 1, mostly because some people probably haven't realized the game has started, things like that. Either way.

On the other hand, FC, people with few posts are actively hurting town. Either they're a wolf floating under the radar or they're not helping town. So they should be disposed of at some point. You get more out of active players, they're more likely to flinch or provide information.