Yeah, because selling arms around the world, that are used to kill lots and lots of women and children is a good thing.
It generates income for Trump's donors, so he gets lots of money.
And the people being killed are mostly 'brown people' in 'shithole countries', so it doesn't matter.
And it's also an entirely symbolic gesture. The Senate never ratified it, so the US was never a part of it.
Also, it only regulates international trade. So the idea that it would affect US citizens obtaining arms inside the US is simply a lie.