TL;DR: No! You cannot make games in roblox based on real-life tragedies as you state.
About the games that you state that have such events, well, changing up the name would not be harmful. You can change up most of the things like the german flag, the sickle and hammer of the USSR etc. The theme can be the same but you should make it look like that you took “inspiration” from said tragedies.
I have mentioned that you can take inspiration. I see that those games have not simply 1:1 copied everything but made it in their own ways. You can do it like that. I said to change up the flags and stuff if and only if you are to replicate it 1:1. If you don’t wanna do all the actions 1:1 then you can keep the flags as well. (Except the german flag for obvious reasons.)
Naval Warfare, a very popular game based on the same tragedy exists. But, it is executed in its own ways. So yes.
It’s not like putting straight up nazi swastika into the game is a proper thing to do.
What about dates? Can I include real life events such as Polish Invasion in 1939? Or should I alter the events so that it’s just a certain “team” attacking another “team” in 1939?