"Secondly, the example you give is typical of news coverage about terrorism. Flooding the news with stories about the attack and the perpetrator, with which you can gain exactly useful information since it's essentially an anecdote."
Point taken:
https://uebermedien.de/11488/kartenlegen-mit-kriminellen-aus...Direct link to the map: https://i.imgur.com/lBvUjTM.png
"It's not a very good argument, to defend a reduction of welfare payments to discourage immigrants from coming."
I can't think of a better one. Or to speak with Milton Friedman: You can have open borders or you can have a welfare state. You can not have both. May I assume you are against a welfare state?
"Immigrants are much more attracted to high salaries (which implies obviously that they want to work)"
Most immigrants that I am talking about can hardly read in their own language. I can track down the statistic for you.
" than by high welfare payments."
Have you ever heard the word "welfare shopping"? They chose the country in Europe with the biggest payouts.
"Even beside all that, you're clearly trying desperately to shoehorn your anti-immigration opinions into a discussion about an unrelated topic."
I don't like that you give the impression I am against immigration. I am an immigrant myself and countries SHOULD attract immigrants. But it is a serious point of consideration that Portugal seems to avoid a specific kind of immigrant.