I ' ve answered this elsewhere , so copypasting it here . It was never beaten out of Harry . He was never taught to suppress magic . Harry never tried to keep his magic inside of him . He didn ' t even know magic existed . Credence , on the other hand , knew exactly what he was suppressing and why . He knew he was magical , but he kept the magic in anyways . This is something Harry never did . Harry was constantly doing magic for his first 11 years of life he just never knew it . This hasn ' t happened for 100 years because it ' s never had to happen for 100 years the wizarding population went into hiding , freeing themselves in the process so they no longer have to hide their magical abilities in their own communities .