While the Vatican does have walls, anyone can pretty much just walk on through them with perhaps a trip through a metal detector, so not sure what you mean.
The Catholic Church also does not teach that there cannot be restrictions on immigration, it simply says that we should treat people with dignity while enforcing such restrictions.
In Catholicism the homily is not the main point of Mass, it takes a far secondary role to the Eucharist. Bad homilies definitely show up, but from the Catholic perspective that does not diminish or detract from the purpose of the Mass as a whole.
But under that argument, you would have to prove your age on a regular basis, the plan right now appears to be that each account would only need to do so once.
Historically, it actually has been very closely aligned with he military. The Scout Oath said at every meeting begins with "On my honor, I will do my best to do my duty to God and my country." There are undercurrents of military influence throughout a ton of their other traditions as well.
I just started University, and as a result I have had my first experience of Internet without NAT. The firewall rules provided are simply On or Off, which has been very strange to me, and it doesn’t seem all that secure.
The Catholic Church also does not teach that there cannot be restrictions on immigration, it simply says that we should treat people with dignity while enforcing such restrictions.