Comment on Ihle, “Towards a quantitative kinetic theory of polar active matter”E. Bertin, H. Chaté, F. Ginelli, G. Grégoire, S. Léonard and A. PeshkovEur. Phys. J. Special Topics, 223 7 (2014) 1419-1422DOI: https://doi.org/10.1140/epjst/e2014-02202-3