Now, I've never had to deal with the new gas cans- I still have some old ones from the 90s. And, full disclosure, I just read over this now, but the overall theory behind the can seems like a pretty good idea- unlock the spout thing, and press the spout down and gas comes out. Take pressure off, and the spout closes, thus preventing spillage.
I will concede that there's a more than unnecessary amount of child-safety things and locks. Not only would they not stop a very determined child they're just kinda silly. Additionally, the lack of vent seems like a design flaw- and a simple one way valve would solve the problem. Or you could use a mechanism like an olive oil bottle. http://previewcf.turbosquid.com/Preview/2014/07/07__18_44_07...
All this is to say that I really hate posts where someone talks about a problem vaguely, and then rants about the government without proposing a solution that isn't "go back to the way things are." Is it a solution looking for a problem? Yeah, probably. Did a bunch of unnecessary stuff get tacked on? Seems so. But it doesn't mean there isn't a problem to be solved.