Shabbos 34 – שבת לד

The Gemara advises one to instruct his household gently ‘so that they accept from him’.  The Rosh cites the Gemara (Gittin 6b) that a person should never instill excessive fear in his home.  This reason would indeed seem a sufficient basis for our Gemara as well; why does the Gemara provide the reason of ‘acceptance’ instead?