I don't know, but it would be interesting to hear from a more liberal view what this is all about without people shutting down or just poo-pooing a discussion of it. If you don't like it, bring some well thought out balance to the discussion.
There's a reason that won't happen: they don't have a common sense immigration policy so can't argue the case for it. All they can do is declare the debate not worth having as an attempt to shut it down and shame people into not sharing their views while making out that they are morally superior somehow.
Every country needs to have a common sense border and immigration policies or else you simply don't have a country. Everything else that happens in a country starts with that.
No one should have the right to enter another country just "because" anymore than anyone has the right to take someone else's property or house. Real basic law-and-order 101 stuff - the breakdown of this is why some countries are shit-holes that people don't want to live in and others are places people do want to move to.
The real answer is that the people in these countries need to stop electing dead-beat corrupt leftist governments that run the countries into the ground. It's no good doing that, then fleeing them and then voting for the same sort of thing which we all know is what is going to happen. If these people were going to become republican voters this wouldn't be on the news and there would be support for the biggest wall outside of China.