The issue is that leftism is incompatible with fascism. Not that leftists can't be bad or evil, they can, but leftism itself cannot coexist with fascism. However, liberalism leads to fascism eventually, and social Democracy is still fundamentally a Capitalist ideology, and is just as easy to corrupt into fascism as shown in Nazi Germany.
As compared to how hard it is to corrupt leftism into Stalinism?
The issue is that leftism is incompatible with fascism. Not that leftists can't be bad or evil, they can, but leftism itself cannot coexist with fascism. However, liberalism leads to fascism eventually, and social Democracy is still fundamentally a Capitalist ideology, and is just as easy to corrupt into fascism as shown in Nazi Germany.
As compared to how hard it is to corrupt leftism into Stalinism?