A smaller critique of total utilitarianism:

In total utilitarianism, it is a morally neutral act to kill someone (in a painless and unexpected manner) and creating/giving birth to another being of comparable happiness (or preference satisfaction or welfare).

You can just finish there.

(In case the "sufficient cause to reject total utilitarianism" isn't clear: I don't like murder. Total utilitarianism advocates it in all sorts of scenarios that I would not. Therefore, total utilitarianism is Evil.)