Obstruction is good.
It cools and tempers the temporary passions of the mob.
That might apply to a direct democracy, but not a representative one. The British Parliament, which has never been hampered by institutional obstructionism (or even constitutional limits on its power), has never been an example of dangerous mob passions. And even among direct democracies, it really only applies to the face-to-face town meeting form, not to legislation by referendum.