...in the capitalist west, fascists and comunists had less scruples about causing national debt in order to mobilise the resources of society.

Michael Kalecki explains that phenomenon rather well. Once the business class bought in to the fascist rule they felt that the state WAS representing their interests and that they would benefit mightily from the bargain. From Kalecki:

                                                                     III

1.  One of the important functions of fascism, as typified by the Nazi system, was to remove capitalist objections to full employment.

The dislike of government spending policy as such is overcome under fascism by the fact that the state machinery is under the direct control of a partnership of big business with fascism.  The necessity for the myth of 'sound finance', which served to prevent the government from offsetting a confidence crisis by spending, is removed.  In a democracy, one does not know what the next government will be like.  Under fascism there is no next government.

The dislike of government spending, whether on public investment or consumption, is overcome by concentrating government expenditure on armaments.  Finally, 'discipline in the factories' and 'political stability' under full employment are maintained by the 'new order', which ranges from suppression of the trade unions to the concentration camp.  Political pressure replaces the economic pressure of unemployment.

2.  The fact that armaments are the backbone of the policy of fascist full employment has a profound influence upon that policy's economic character.  Large-scale armaments are inseparable from the expansion of the armed forces and the preparation of plans for a war of conquest.  They also induce competitive rearmament of other countries.  This causes the main aim of spending to shift gradually from full employment to securing the maximum effect of rearmament.  As a result, employment becomes 'over-full'.  Not only is unemployment abolished, but an acute scarcity of labour prevails.  Bottlenecks arise in every sphere, and these must be dealt with by the creation of a number of controls.  Such an economy has many features of a planned economy, and is sometimes compared, rather ignorantly, with socialism.  However, this type of planning is bound to appear whenever an economy sets itself a certain high target of production in a particular sphere, when it becomes a target economy of which the armament economy is a special case.  An armament economy involves in particular the curtailment of consumption as compared with that which it could have been under full employment.

The fascist system starts from the overcoming of unemployment, develops into an armament economy of scarcity, and ends inevitably in war.