"Deport terrorists" is a moronic slogan. There is like only a few people that can be deported based on evidence of terrorism. Also, deporting costs resources meaning we become poorer. They should just be killed!
Better ones:
Europe for europeans!
No money for Palestinians (EUropean countries + Norway + UK historically pays almost everything, the Palestinians have very high population growth rate made only possible by external aid and food imports), no money for Israel!
If you are black, go back!
Sieg heil!
Mediterranean wall with MG-42 embankments as a welcome, not NGO rescue ships!
Abolish asylum laws! (and withdraw from the 1951 Convention relating to the Status of Refugees in 1957 and its 1967 Protocol. Most of Asia is not even a part of it, except Japan, South Korea and Yemen and a few others (Yemen the only Arabian party, none of the rich GCC grant the right to apply for asylum))
This is war. Act like it.
We should kill them while we still can!
Arabs/islamic immigrants don't let european men interact with their women, why should we allow them to interact with european women?
Women's voting right; the biggest mistake of our civilisation
Bring back death penalty; why criminals are allowed to kill while the society is not? (show stats how expensive one life-sentence is and how much one day in prison costs per prisoner)
The highest-emitting and richest countries are all officially developing countries in the UN and all its treaties (Singapore, Qatar, UAE, Brunei, Bahrain, Oman, Saudi Arabia, Kuwait, South Korea, Israel, Taiwan, Grenada, Monaco, San Marino, Liechtenstein, Andorra, Vatican, Gibraltar etc....) (just look at the Annex II of the UNFCCC, there you find the countries/payers who are paying for everything UN. Without them paying the UN system would collapse. Portugal and Greece are Annex II despite Singapore being richer and higher emitting already in 1992. And there is no mechanism to enter new countries to the list other than the country itself volunteering to enter the list, to take the responsibilities of a developed country party to the treaty, which no country of course has ever done and never will. All UN treaties are like this: the developed countries are the same countries that never claimed developing status as the UN system was formed after WW2. South Korea, Israel, Singapore, Qatar, Kuwait, UAE, Uruguay etc. can forever remain developing countries (also in the WTO, not only in the UN) if they so choose and of course they do not want to lose their status, because they don't want to be required under UN treaties to transfer their wealth to other countries. The solution: Annex II of the UNFCCC countries should formally withdraw from all the UN treaties that grant Singapore et alia privileges because of self-claimed developing country status and stop paying until there is a objective, impartial examination of what countries should benefit from developing country status and how to automatically ensure that the list remains fair as years go by. No permanent membership to India and other "developing countries" in UNSC until this is solved (India is LOWER-MIDDLE INCOME and China also is still not a developed country, only UPPER-MIDDLE-INCOME)
UN: income-transfers from the West to the Rest
Right to asylum is enshrined in EU law, change it or demand an exit from the EU
Death penalty is against the Council of Europe rules, withdraw from the treaty
Protesters should display a graph depicting the IQ distribution and what professions are possible with the IQs displayed. Then show clearly what the science knows about the intelligence of sub-Saharans who cross the Med
Rape statistics of black Africans
Also show statistics how the asylum seekers are single, young men almost exclusively that cross the Med, scale fences in Ceuta and Melilla etc.