Ok, I have not followed the news too much on Syria besides the main points.
The so-called international rules are a bunch of BS decided by corrupt men (most men are corrupt). Therefore, to me, they have little value.
So a country, like North Korea, that is not part of the UN, can kill as many civilians as it wants? So a little bit of paper determines what is "just" action and what isn't? Those sanctions against NK are different from parking a naval fleet near the shoreline.
It seems like countries, especially the West, pick and choose where to assist, where to bomb, where to do this or that. Of course, this has zero to do with "human rights" or any other fancy term. It's all about power. The Middle East is the place to be at the moment.
As for what are "we" supposed to do, I can mention a few things. We are not doing anything. It is the politicians doing what they want. Additionally, we don't really know what is going on anywhere, let alone Syria. So before we get too carried away, let's not cause any more deaths by taking so-called action. We just know what the media is telling us.
Also, do you really believe that taking out Assad will improve things? I highly doubt it. Leaders can be changed but the population remains the same. Therefore, it will have little impact in real life. In the news media, there will sensationalism and all sorts of experts offering their views - just like they did when Mubarrak was overthrown. In the end, it doesn't change much. That's because people don't change much, if at all.