Plato's love for poetry

Plato is a pessimist. He kept mentioning his distaste for poetry because it enhanced emotion? I had no idea that it was bad to cry or laugh or simply be amused. The most delicious part of life is pleasure and happiness and why not have it without a cost. Sure, I will credit the fact that poetry is unrealistic and as he mentioned, it was all lies, but the farthest one could get from the realism is through non-realism. What was also condratictory in my view was that in Plato's Ion and The Republic 2, Plato was able to make Socrates that he was correct all the time and made Ion a calm, "yes-master" character. Is that not unrealistic? He gave Socrates a chance to big rants while the character to which he was speaking with was always "yes" and "no."