It's impossible for town to lynch two scum on the same day. If a scum is up to be lynched, they'll just break the breaking strategy at the last moment, almost certainly managing to force the lynch onto a townie and nobody else (unless
everyone
run up is scum), and although that exposes them as scum, it's better for scum than them dying, and town will have to spend another (untied, to prevent the same trick being repeated) lynch on them the following day in order to actually lynch them. In this way, a scum can trade themselves for three townies if scum and town are ever run up at the same time.
The best strategy as town is probably (although I'm not sure) to multi-lynch a few players (but not too many!) on day 1, and then switch back to regular lynching on subsequent days (to prevent scum catching them out by last-minute tiebreaks). If that is the best strategy, then this is scumsided at 10:3 (but still probably townsided at 11:2). There may be a better town strategy I haven't thought of, though.