You should anyway!
You seem to think that humanism is always weak, but it can be agressive.
When I say humanism > nationalism, I do not mean that we must all love each other and pray for a better tomorrow; but working toward a future where the various nationalism are removed in favor of one culture, human.
I believe thats where we are headed mechanically, the "rest of the planet" is just a pocket of resistance that will be pervaded just like the rest. How and when is the real question! There's also the question who will survive? But thats really obvious to me, I do not fear any Caliphates taking over my beloved western countries like some stupid nationalists with an agenda.
While I gree that humanism/humanitarianism have in some cases brought out the best in people, it like pretty much everything else has also been hijacked by some to be used as a political weapon to force change on people whether they want it or not and has led to inhumane actions, inhumane environments and encouraged inhumane politics. We can see examples of this from the spread in use of GMO crops, fund raising events like liveaid, through to economic and military interventionism to name a few.
It seems to me there are forces out there who would like to unite the world under a single unified ideology, and I'd argue those working towards this at the moment are the political centre, the established political systems in the West, who are actively facilitating this possible eventuality. Some of the tools they use to achieve this aim include promoting the idea of a "multicultural society" where peoples differences, cultures and nationalities are celebrated... But at the same time, the same actors are slowly stiffling the multinational and multicultural identity of the world and one of the ways they do this is by placing an economic stranglehold over countless foreign governments and politicians with the aim to subvert. So what we get is, progressive social politics but a regressive, imperialist/expansionist geopolitics, which are arguably a contradiction of policies. Social progression is something we encounter in our day to day lives, it's something quite tangible to us in the West, but geopolics? That's a different story, it's done out of sight and out of mind, unless reported on and by and large that information is usually controlled.
I do think if we as a race or if the planet is around to witness it, we will eventually unify as a global culture, a global community with shared values.. But at our current level of development I think we've got a long way to go to achieve this. Instead of allowing for this conclusion to come about naturally, I think there are neferious forces whom get our politicians to dance at the ends of their puppet strings. The puppetmasters are those like billionaire George Soros, who for example uses his wealth to promote political ideology through the various NGOs, corporations or governments he's in bed with, funds or created himself. His aims are to encourage immigation, a multicultural society and it seems others like him with similar goals are trying to quicken the pace of a single world government, single world society and human identity. They want to pool the worlds resources, including us and all our energies and efforts into selfishly realising their own dreams.
I think the artificial manipulation of bringing about a closer, more unified global society, a more unified human race or even one world government is dangerous and will lead to disastrous consequences for the entire planet, maybe even a third world war. You see, for people like George, national identity is the nail that stands above the rest that needs to be hammered down and only once the last nail is hammered down can a single world government be introduced and single world soceity be encouraged. On the local level multiculturalism works to their advantage, on the global level it needs to be snuffed out. Some nails don't go down without a fight and it's this resistance that could produce enough friction that triggers the spark that ignites the next global war.
To bring this post back into the threads context. With Britain remaining in the EU, it too will remain a nail that has already been hammed down. Federations of states, and federations of federations are likely to be the first steps on the path to a unified world government, and which is why for some reasons above and others mentioned elsewhere I'm voting to leave.