I don't have any specific replays to show as an example of this, but I've noticed a tendency lately for players to sneak loaded mafias into their games by having one or more any randoms that are set to automatically be mafia in their save.
In every instance I've encountered this, and been on the over-stacked mafia, I've gone out of my way to suicide and thus almost-but-not-quite even the odds (town still winds up with one less than they should, and they have to waste resources killing me off, but otherwise it gives a huge boost to evening things out).
Statistically, according to research that can be looked through on the wikipedia entry for the game Mafia, the number of mafia should be roughly equal to the square root of the number of town. Since most games are 9 town, 3 mafia, 3 neutrals, this tends to work out.
Is my suiciding considered griefing or gamethrowing in this instance, when the mafia is stacked with four or five members? If the consensus is yes, I'll probably desist.
But I've only been harassed for doing it on one occasion (by the host of the game, who intentionally loaded mafia, then pulled GF, and wanted a perfect game achievement). Most of the time, players thank me. I've been called, "a real bro." I'd be interested to hear some feedback from people to see their opinion on this.
The way I've been seeing it, once a game starts rigged in that way, my pseudo-trolling by suiciding gives the troll-save a nudge towards course correction, and is thus not just an okay thing to do, but a good thing to do.