I like to think that I should not be able to kill someone with a GNU Radio setup and a cheap laptop.
If you want to kill someone, there are considerably cheaper options available at your local big-box store's home and garden center.
Seriously, though, I do agree with your concern for systemic problems in security thinking. Given the vastly more concentrated effort required, I don't think it's a problem that one could theoretically kill with GNU Radio and a laptop, versus any of the hundreds of tools more readily repurposed as a murder weapon, but such exploits are best addressed while they are unfeasable.
If you want to kill someone, there are considerably cheaper options available at your local big-box store's home and garden center.
Seriously, though, I do agree with your concern for systemic problems in security thinking. Given the vastly more concentrated effort required, I don't think it's a problem that one could theoretically kill with GNU Radio and a laptop, versus any of the hundreds of tools more readily repurposed as a murder weapon, but such exploits are best addressed while they are unfeasable.