You’re making a lot of unfounded assumptions about what would have happened if Trump were assassinated. No one else has been able to harness MAGA energy the way he has. It’s entirely possible the movement would splinter without its figurehead. We won’t know that until he’s gone. Although it seems less likely now that he presumably has 4 years to enact policy changes and put people in place to keep his agenda moving after his term is up.
There’s plenty of debate to be had on the topic of the effectiveness of guns in civil resistance. All of which can be found in more detail elsewhere than we’re going to be able to cover here. However, suffice it to say that your understanding of resistance in general and guerilla tactics specifically is severely lacking if you’re assuming that this situation would play out as an open confrontation between the US military and some sort of militia. Despite the fact that such a conflict would provide more room for maneuvering than you are giving it credit, that would not be the preferred method of engagement. Generals and other senior officers have to buy groceries and go to the DMV just like everyone else. You pick your targets when and where you can get them. More than anything else, it’s important to acknowledge that in the situation where it becomes necessary to think about these kinds of things in more detail, my guns afford me many more options than your knives (or whatever else you prefer to rely on) would. Unless, of course, you plan on giving up without a fight, in which case we clearly have such different outlooks that additional discussion will not help us find common ground.
You’re talking about a guy that could pay 100 million dollars for a new account and not even notice. He obviously wouldn’t pay anywhere near that much for something like this. There is no financial cost you can force on him that will change his behavior.