"Lawyers. No one pays attention during the briefing, no one looks at the card showing the exits and such."

Your attitude to air safety saddens me. If you can't hear the safety briefing, complain. There's plenty in it which you need to know. For example, if you put down on water and have to don life-jackets, it really is important that you don't inflate them too early. They will get in the way and block the exit. You should know where your nearest exit is.

Thinking about it and making a plan in advance is one difference between the people who freeze in place and the people who survive. There's a recent thread here which links to a Times article which talks about this. Read them. You can take some responsibility for your own safety even when on a 'plane.

"Something tells me you aren't going to need to start a fire, and if you do, well... there's probably lots of stuff still burning... pick something."

If you crash somewhere cold you might well need a fire. You can't assume the plane will be burning and even if it is, it may not be safe to approach.

"(thanks TSA!)"

Well, that's kinda the point of the discussion, isn't it? What useful stuff is the TSA preventing us from bringing? What can we bring anyway? Giving up is rarely the best choice. Whether your PSK would be any good rather depends on what you put in it. If your attitude is, "Disasters only happen to other people", why bother carrying one at all?