To a certain extent if the lead developer issues a release and says it's critical we have no choice but to trust him. But, outside developers can and should perform their own independent audits of new releases to see if something suspicious is done and raise the alarm if need be.
Most Nxt users are not "developers", so while I take your point, I also suggest that most people are being asked to update software without being able to understand OR verify the reason for the update. It's the software-developer equivalent of "trust me. Just do it."
It's hypocritical to build a decentralized system that is supposed to be trustless, and then ask "untrusted" members of that community to "trust" that they should install new software and not ask questions of the "untrusted" people who issue the order.
You can do your own thing, of course, but I won't give. I'm not gonna jump off a bridge just because Jean-Luc or CfB says so. What they've done is bad, and they should feel bad. When I get an explanation, I'll update my software.
It is unfortunate they had to do it this way, but if they said it was urgent, then it most likely is. The fact that both of them (and I suppose the implicit approval of BCNext) approved it makes it not as bad. C-f-b did say he would disclose what it was, but I'm sure how won't do that until a large majority of nodes have upgraded to 0.6.0.
While its possible for someone to secretly add something inside for his own selfish need
BUT in this case, its Jean-Luc and CfB for crying out loud.. im sure they would not try to do anything that is bad for nxt, it would be in their best interest to do what is right. If they don't the whole eco would collapse over night. They are the lead devs, from what i know they are probably the only ones coding nxt for what it is today.
If you won't trust the only core developers, i don't know who else is there to trust in such situation.
I'm pretty damn sure they are pushing this update for one reason, that is to prevent exploitation of the said critical bug.
And to me, it sounds pretty serious when they are not saying the specifics of the actual bug, maybe they are hoping for majority to update and be on the 0.6.0 chain before such bug is exploited thus not providing such details.
To sum up: ITS SAFE TO UPDATE to 0.6.0 so please everyone upgrade as soon as possible before someone finds such exploit mentioned.
CRITICAL MANDATORY UPDATEhttp://download.nxtcrypto.org/nxt-client-0.6.0.zip