Ukyo as my statement in the BTCT thread suggests I agree mostly that it should have been handled differently, though there are a few things to add:
Your statements mostly reflects your point of view as a shareholder that perceived a subjective loss of value. The terms of service of BTCT are pretty clear on contract breaches for securities:
If you are proven lying on your contract, your asset issuer information, or in any communication with the exchange, your asset will be frozen indefinitely, all assets you hold on the exchange will be frozen, and your asset will most likely be delisted.
...
If found in violation of these rules, you will be given a warning and will have 7 days to come into compliance. If you do not comply your asset will be delisted.
I'm not sure, if you like to turn this into a discussion about if and what points of Labcoin's contract were breached and if burnside's reaction by posting a warning instead of freezing or delisting Labcoin was congruent with his own terms of service, but the baseline is pretty much this: what he did was more or less within his possible options of what he might do as an administator of BTCT and users should have been aware of this.
From a traders perspective there are always two sides: the ones who are buying and the ones who are selling. You can't favor one side by saying "it's unfair". Unfair to whom?
My personal opinion about Labcoin is mixed and I love to speculate on it as well as every rally or good news provided by Labcoin, but I wouldn't advice anyone to buy Labcoin shares, because I see this as a great and well managed company at the moment. I'm rather in favor of overdoing the "investor protecting" part to minimize that ratio of "people that are getting screwed" to those who are very well aware of the risks they are taking and missteps done by Labcoin.
I hope this warning is a wakeup-call for Labcoin and they improve on what they are doing, so that everyone will profit here and not only a fraction.
Edit: Meta: Please don't get me wrong, I'm also in favor of more warnings on BTCT in general (though not with any additional regulation or arbitrariness as Ukyo has lined out), because the risk of failure from the issuer is not the only ongoing risk, but also the rising level of attempted manipulation on the forums (both from bulls and bears) and related areas is alarming. Just to recap the last 20 hours: we had one guy saying he is Labcoin's new PR guy and he was posting pictures of hardware and only a few hours later a fake TheSwede75 appeared on IRC who has now registred this nickname on freenode and who successfuly made TheSeven believe it's actually him and possibly extracted valuable information based on that. And let's not forget that the topic of the last several pages is a discussion about "are the payments sent to Labcoin's Bitcoin address really from Labcoin or not".