Trial of marshal Tukhachevsky: the opinion of historians-Stalinists

Among the victims of Stalin's repressions there was Marshal of the Soviet Union M. N. Tu khachevsky. He was accused of preparing a military coup and treason. In 1957, the USSR Supreme Court acquitted him, for no proof of his guilt was found. However, some historians, journalists and public leaders insist that the conspiracy took place, and the higher courts of the country were wrong, having rehabilitated Tukhachevsky. Why do they think so and do they have any reasons for it?