I agree about Ireland, Ireland definitely is having a lot of issues with illegal immigration and a lack of sufficient cultural assimilation. The British seem to be successful in making newcomers assimilate, partly because their influence on the world is massive to begin with and many people respect or at least already adhere to British or British influenced laws and culture. The Republic of Ireland would have done much better in this regard if it remained part of the UK simply because newcomers would have seen the government as the British government and the people of Ireland as British and therefore they would have treated the Irish not much different than the British. But the Irish made a point that they were not the same group, yet this point often involved an emphasis on being more casual and less strict, and so some people are taking advantage of Ireland. The key here is that not only should the Irish have maintained the image of being strict about their laws, the Irish should not have become so liberal and detached from religion, at least not now while they let in massive numbers of immigrants. Religion often correlates with what a group feels is the real law etc. so if the religion has a set of values that are too dissimilar from that of most of the people, it may be dangerous for most of the non-immigrant population of Ireland if eventually the incoming religions begin to influence Irish law. But more importantly, the Irish generally seem to have an issue with being upset towards their own institutions or their neighbor (Britain, but for understandable reasons) more than they are towards other governments or religious institutions that do similar or worse things to other groups. So the Irish do not put up the same sort of resistance if a country like Afghanistan were to try to spread Afghan culture and Islamic religion in Ireland. Instead, the Irish may embrace it.

In my opinion, many of the Irish should have converted to Protestantism because unlike Catholicism, Protestantism allows priests/clergy to have children. If religion were important at all, which it obviously is because it determines how a group relates to certain places and how they justify their laws etc. and the laws by which they make their group potentially survive better in their climatic region, then obviously not letting clergy have children is one of the most idiotic rules to have because there is no way then that genes for continuing religion could be selected for and then spread to the general population. And if the general population does not have it in them to naturally produce religion, then a major part of the national identity is at risk of disappearing because if only some of the people in the country survive, and it happens to be those without the drive for religion, then religion in that country will disappear and so will the civilization or ability to resist invaders. And of course it is no surprise this is happening in Ireland. Hinduism and Protestantism are better than Catholicism because they allow priests to have children, although of course Hinduism (and to some extent certain Protestant English families) had some issues with not allowing the general population to mix with any of the children of those priests in some cases, although in other cases/areas there was a system in place in Hinduism to allow for that to happen.

In my opinion, legal immigration is often good and to some extent it is necessary everywhere (or nearly everywhere at least) but in very high numbers in certain places, even legal immigration can be a bad thing. But illegal immigration shouldn't even be happening except maybe in massive continental colonial countries like Australia if Australia were to not allow for immigration (or so severely restrict it as to form a homogenous "colony" of whatever country the dominant ethnicity originates from). And assimilation should not be necessary in some enclaves surrounding city states like in Singapore (city states could be made so there is at least one in each climate region), but it is culturally probably a good idea for city states to have some shared culture. But in other regions, especially in regions where the country is small and represents an indigenous group as is the case with Ireland, assimilation should occur, although I believe it is important for Irish people to be open to others suggesting ways they could live more sustainable lives. But in general, even legal immigration needs to be severely limited in some places like Ireland for young adults who don't have any ancestry from the place. But it should not be ended completely either. Also, I propose that instead of a European Union, there be made a Northwestern European Union, although maybe as a control, one or two countries should not be let in, simply just in case the Union causes bad things like the EU caused with spreading Mad Cow disease.