why was the burning of the reichstag good for hitler? was it because the communists were blamed?

Answer 1

Reichstag fire, burning of the Reichstag (parliament) building in Berlin, on the night of Feb. 27, 1933, a key event in the establishment of the Nazi dictatorship and widely believed to have been contrived by the newly formed Nazi government itself to turn public opinion against its opponents and to assume emergency powers ... his propaganda minister, Joseph Goebbels, is supposed to have devised the scheme. ... On Feb. 28, 1933, the day after the fire, Hitler's dictatorship began with the enactment of a decree "for the Protection of the People and the State," which dispensed with all constitutional protection of political, personal, and property rights.

Encyclopaedia Britannica

The Reichstag fire was a disaster for Communists because they received the blame for starting it, but it was a dream come true for Hitler and his cohorts as it allowed them to turn Germany into a dictatorship.

http://www.whatreallyhappened.com/911_reichstag.html

Answer 2

Hitler staged the burning of the Reichtag, so that he can declare Martial Law. He then blamed the Reichtag fire to the Communists. The declaration of Martial Law gave Hitler absolute power to eliminate the Communists and his political opponents (by fabricating charges that they were Communist supporters).