Just so we're clear, 50-80 years ago I wasn't alive. ;)
But if you insist on doing things this way, you could make this sort of case about all sorts of countries:
"50-80 years ago, you were killing Jews in Europe; now you're not and are so happy about it." Well, except not everyone is happy, of course.
"50-80 years ago, you Japanese were enslaving people in countries around yours, now you're not and are so happy about it."
"25 years ago, you Swiss wouldn't let your women vote in elections in your canton, now you do and are so happy about." See https://en.wikipedia.org/wiki/Appenzell_Innerrhoden#Women.27...
> Now you doing opposite and are so happy with it.
I dunno about _happy_. There are a bunch of people not happy with marijuana legalization, and a bunch more who are not terribly happy with it but are even less happy with the state of things.
Just like there were people who were not happy to end alcohol prohibition, but were even less happy with the state of things when prohibition was in effect.
> Now you like LGBT, in 50 years you will kill them.
Just like the Swiss will repeal women's suffrage and various countries in Europe will go back to murdering Jews, right?
Or perhaps, just possibly, that might not happen? Maybe?
> The problem is that you do all this things to the world.
Really? How, exactly, is "the world" affected by the legality or not of marijuana in the US? There's some interaction with our immediate neighbors due to attempts to eliminate smuggling operations, but other than that, what is this doing to "the world"?