Yes Xavier was talking about the succesful assassination of X-force on X-men #4 by Hickman but I am not talking about that, I am talking about HoX #1 in which Magneto engages with the ambassadors instead of Charles because they had reasons to think an agent was send to kill off Xavier, which actually happened. Erik and the Cuckos were there to stop this attempt.
I agree a foreing agent is expect to have weapons but at a diplomacy meeting, this is a reason to end all kind of diplomatic communication unless everyone there has weapons and this was previously agreed by all parties before going, like at this type of meetins even the food eaten needs to be aproved by everyone before engaging in the meeting.
I also agree Xavier was talking about the X-force attempt and Magneto here was mostly showing Krakoa diplomatic stance of keeping close borders, Krakoa will have itīs own culture but will engage economically with the rest of the world once itīs been admited as part of the UN but I agree with you his tone was not conducive to a peaceful end of meeting but given the fact the other ambassadors already thought only in terms of Krakoa being a military menace I think magneto went for the old approach of not engaging with them on equal footing and instead showing them they already knew their standing in relation to Krakoa.
I donīt see things this way, I will explain next:
Magneto of First Class has nothing to do with comics magneto besides the more superficial common ground, like powers and parts of his past imo Fox really didnīt want him as more than the villain of the week and his actions sometimes didnīt made sense. Things got a little better with the second trilogy but even in this they made his main motivations a personal matter, not a political one and comics Magneto definitely has political reasons behind his actions.
Not a lot of people at marvel know about his Jewish heritage, besides his children, Lorna, Wanda and Pietro and old friends like Gabrielle Haller who was also jewish holocaust survivor and who defended him during his two trials, Charles, Moira, Storm, Scott, Wolverine, Rogue and some other X-men, Dr Doom, because he used tecnology to investigate him and Cap America but he doensīt know all the details and still not even all of them know or use his real jewish name and this was done on purpose, because Magneto didnīt want the world to see his actions as a representation of the Jewish people, when heīs doing it as a personal crusade for getting mutants rights. This doesnīt mean he has stoped caring from his jewish heritage, in fact the reason why he accepted to be judged for his actions as Magneto during his first trial was because he didnīt want Mystiqueīs brotherhood to menace or hurt the other people who were visiting the holocaust musseum, some of which were fellow survivors as well.
Magneto doesnīt use the holocaust as an excuse for his actions at all but the fact itīs part of his story, this event informs his actions in a big way but itīs not all of it,after the holocaust he tried to live a normal human life and even after his daughter was killed, he still went to Israel and tried to live as a normal person there. He didnīt really become "Magneto" until he found out about the papperclip event, in which foreing occidental goverments were using Nazi scientist to get an egde on the Soviet Union, pretty much giving them an out, which just served to prove to him humanity would just keep going on oppresing different groups for their self interest, which made him decide to become Magneto. Now, even as Magneto, his actual mission is not about killing humanity, as Apocalypse would do but about a paternalistic/Authoritasictic view of him trying to put things in order in the world even if he has to use force and making a comparision of humanity behaving like children being willing to hurt and kill each other and that he was just not going to let mutants suffer the same way other groups had suffered in the past and he didnīt really began to change this mentality until he almost killed Kitty and itīs not a coincidence Kitty being jewish moved him to truly try to change.
After this he tried the X-men way for a while but found it didnīt suit him so he became a separatist and he has keep being that to a bigger or less extend until the Krakoa era.