You need to read more. Half truths are worse than misinformation (fake news). All of the above were a sequence of events that got the ball rolling, but the key to ALL of these were two" 1. Mobilization (General Staffs were paranoid and didn't want to get caught flat footed), so ostensibly it was almost a de facto declaration of "intent" to go to war (so see who mobilized first) 2. The 500 lb gorilla in the room was England and they did not pull the trigger until Germany violated Belgian neutrality because they were so married to the Schieffen Plan they refused to deviate. So much so, there was a last ditch attempt by the Kaiser himself to stop, but von Moltke (the junior) told him "too late your majesty, the troop trains are already rolling." Bottom line, no invasion of Belgium, no war with the western allies.
It's arguable whether the invasion of Belgium was a good move, but Germany had to bring the war to the allies at that point due to massive British and French mobilization that was underway in France for war with Germany. Had they waited for them to strike first on German soil, the Germans would have been at a huge disadvantage.
