It is a conflict of interest of course. However, if their desire to see the stock trashed ends up in proof that LL broke actual laws, their underhanded motivations can nonetheless serve the greater good, rather like if I shot a gun in the air randomly, an immoral action, but the bullet ends up falling down into the skull of somebody about to commit a mass murder.
Hardly. If Tilson and friends' account is is the truth of the matter, then there isn't any conflict; they just found the reason why the financials looked odd in the first place, and are in the best position to try to do something about it, having an interest, and evidence. No randomness, or serendipity.
Tilson may technically have run afoul of insider trading regulations, but if this all turns out to be true, will likely be treated more as a whistleblower. I don't see any underhanded motivations, personally. If this is as bad as expected (IE, the board members knew), then LL deserves far more punishment than they could possibly receive. If it was middle management, or some isolated part of LL, then they need to be hammered, and forced to reorganize, with some oversight, auditing, and product testing. In addition, the public at large needs to be aware that this crap didn't end with FEMA trailers being swept under the rug. The investors bringing suit have the best means to help get it done. Enlightened self-interest may sound noble, but it may get a bit dirty when it comes to practicing it.