You cant say "they" on a topic like that.
I just did. So obviously I CAN. You may not agree with it, but I still CAN.
If they are displaced that does not mean I should allow them into my country and then allow them to ignore the laws of my country and culture because of their culture. If we CHOOSE to give them a home then that is for them to integrate. WE/ME/YOU are not obligated to give any of THEM homes. Yet we can choose to.
Many invaders in the past invaded lands as they fled something else. If they have no intentions of integrating and becoming productive and instead demand their new home change to accommodate them then THEY (see I did it again, so I can) are invaders.
If THEY are invited (regardless of their circumstances because they are irrelevant to the term) then that makes them an immigrant. If they arrive without invitation (aka illegal) then they are invaders.
You can mince words all you want. The actions are what matters. If they do not integrate and they are allowed to RAPE because it is their culture, if we are not allowed to fly our FLAGS because it might offend them, if we tear down our churches because they are against them, but put up mosques/churches/whatever for them.... guess what??? They are invaders. Just because politicians were stupid enough to open the city gates does not change that.
There's never been an example of a refugee group entering a country and ignoring the laws as a collective. These are generally average citizens seeking a new life. An invading army is something else.
I love it when people who throw the idea at me that I should use LOGIC and not emotion are so caught up in using absolutes. You are very fond of the word ALWAYS and in this statement you said NEVER. Here is a clue. Absolutes are rarely true. It is very dangerous LOGICALLY SPEAKING to just casually throw them out there. I would assume based upon this statement you made that you consider yourself an extremely knowledgeable historical scholar who knows EVERY refugee situation in history. I mean that would need to be what you think of yourself if you can confidently throw the word NEVER out there. So since you said I should be logic I'm going to keep calling you out on it. As I will say now that your absolute there is FALSE. Nice try though.
You see the key here is that people tend to call those fleeing an invasion or bad situation REFUGEES.
The problem is if those refugees then enter a country and do not assimilate with that new country and instead take it over then they have also invaded that country.
As @everittdmickey pointed out the Koran itself has a name for invasion by immigration and it is called Hijrah.
Wave of refugees to Europe an "organised invasion" says Czech PM
Kuwaiti Invasion Refugees
Whistleblower Reveals That A UN-Planned Invasion By Refugees Into The US Is Already Underway
There is much more. That is just a bit I found by doing what YOU should do before casually saying NEVER. Yet, since you espouse logic and then use absolutes so casually I thought I'd do some work for you.
Your statements in the various responses here that used the term ALWAYS or NEVER are all false simply due to you choosing to use absolutes. If you want to say MOST or FEW which doesn't make it an absolute then they might be accurate. Yet it is you who stated logic should be used and not emotion.