Lox:. "Assuming the army or police agree to serve a government that would act in this way towards its own people."

Exactly. Fascism and democracy are incompatible. Therefore, the only way in which the BNP can achieve power is by destroying democracy. It happened in Spain, it happened in Chile, and it happened in Greece.

"the fact that the Nazi won in July 1932 did not make them any less evil and insidious." In point of fact the Nazis never got into power by a straightforward democratic majority. The only election in which they won an overall majority was in 1933, after they'd locked up the Communists, Social Democrats and trade unionists.