As opposed to tying your hands while you get constitutional authority to blow up a building terrorists are assembling nuclear suit case bombs to smuggle into the country in shipping containers.
Straw man. If there is a group of terrorists assembling nuclear suit bombs to smuggle into the US, there is nothing stopping the government from stopping them.
On the other hand, if there is a guy who has been expressing hostile opinions for years, sympathetic to a group who might someday make such weapons if they ever get the chance which they have not yet and there's no indication they will in the foreseeable future, then having the President unilaterally claim someone has those hostile opinions and deserves to be killed, as judge, jury and executioner, outside any proper legal system when it's not such an emergency, is another matter.
The sad fact is that folk on your side of the argument fail to weigh the risks of legal nicety over against the threat of madness we are up against.
No, the sad fact is that you have your finger on the scale and are pressing it with all your weight to one side. I'm for effectively addressing the actual threat.
To aid, abet, or affiliate with Al Quaida in any way other than as a spy, an organization which has among it's various aims, destroying America by terrorism, is to declare war war against the American people. If you can be gotten to by the President of those people in any window of opportunity you're toast. We have 9/11 over your fear of Hitler.
Yes, let's just give up our values and legal processes to the terrorists, and give them that victory wit a ribbon around it.
And no, I don't think the wife of an Al Queda leader who makes him dinner - which falls in your definition - is 'declaring war on America'. That's hysterical, not ha ha, but screaming panicked hysterical. When Ron Paul and others say 'Al Queda has some valid criticisms of the US, which don't justify their violence', that falls outside your definition, too. They aren't declaring war on America. People can even support various goals of Al Queda without declaring war on America. Is wanting fundamentalist Muslim countries - something I strongly oppose - now 'declaring war on America'? How about evangelical Christians? The Amish?
Murder isn't accepted. You might say a murderer is 'declaring war on America' the way you say Al Queda 'supporters' are. So, should we abandon our justice system that lets murderers go free all the time - more than a reasonable doubt is hard to prove - and let you shoot people you think are murderers? Should Obama have a secretive execution panel for any American they think has murdered outside the legal system?
You think Richard didn't want to have Daniel Ellsberg or Jack Anderson or Ted Kennedy (who he had under surveillance) or others killed?
The FBI wanted to kill Martin Luther King, Jr. and made efforts against his life. Wouldn't this have been a convenient and more effective process to use?
Should assassination become a routine, far more widespread activity of the White House with no oversight, from now on? What could go wrong?
What's stopping that from happening? Nothing.
Just because you like and trust Obama to use such a power responsibly doesn't make it a good idea.