they had the same policy of appeasement that you want. give money and weapons to defending country. and the british even had a formal alliance to join the war in defense of another nation, which you also want. I would be careful about those glass houses.
might want to look at the timelines, and you will see how Churchills aggression to push the Allies forces further into belgium & holland over stretched their lines. that wasn't the plan before Churchill. the quick time in the changes of plans is one of the reasons it wasn't successful. He became PM on May 10th, Dunkirk was June 4th. plenty of time for him to get in there and meddle. if the British and French had stayed in France instead of overextending into Belgium & Holland they would have been in a far better place to defend. Churchill thought it was important to save Belgium.
You clearly know 0 about World War II.
Churchill became Prime Minister on May 10, 1940 as you stated. The operations in the Benelux, the general British operational strategy, the deployment of forces, etc. was already in place by his predecessor prior to all of this. Churchill had 0 input in the overall strategy of the Battle of France until after it had already started and was the focal point for Dunkirk which saved the BEF and a lot of French soldiers (basically he did the opposite of what you are stating and helped get the Allies out of the mess they were in).
Your ignorance of history is astounding.
You do know that in war, you can't just change battle plans and move forces around in 2-3 days (especially back then). You could have limited input but the BEF's deployment and strategy during the Battle of France was entirely on Chamberlain. Also, the UK (due to the numerical strategy of France) had delegated all battle strategy towards France so it really wasn't even on Chamberlain as well but rather failed military strategy by France. Had France, literally, counterattacked the German advance early or put a few more divisions at Sedan that could have held out, the operation could have been a major German disaster.
Of course if you seriously studied WW2, you would know all of this but everything you have said is way off. There are tons of World War II fan groups/videos, etc. out there. I suggest you join them. Facebook has some solid WWII pages/groups that you can join. Historians post videos on Youtube and articles regularly including actual speeches at major Universities on the topic.
Regarding your French Aggression argument, I present a summary of the following points:
1. The Little Entente treaties obligated France to defend newly independent nations in Eastern Europe from German Aggression
2. Germany illegally entered the Saar and Rhineland which was overlooked by France and violated the Versailles treaty
3. Germany broke the Munich Agreement by taking over all of Czechoslavakia
4. France was obligated to protect Poland (along with UK and Italy) under the League of Nations charter
5. France signed the Kasprzycki–Gamelin Convention as pointed out in this thread
6. France signed a military alliance with the UK indicating that if one goes to war, the other will follow
All 6 above are, individual, grounds to write off France as the aggressor
This also overlooks German violation of the Versailles treaty regarding military buildup, deployment of air force (which was forbidden), deployment of tanks (which was forbidden), and the building of U-Boats (which was forbidden).
Basically, Hitler crapped all over Versailles.