M"B paskens (131:26) that a chassan should daven at home during his sheva brachos week because if he comes to shul he will cause the tzibur to miss saying tachanun (if you're like me, you're thinking, "So what's the downside?")
Question: וכי אומרים לו לאדם חטא כדי שיזכה חבירך?! (Shabbos 4a)
Why should the chassan be forced to miss tefilah b'tzibur on their behalf?
Answer: וכי אומרים לו לאדם חטא כדי שיזכה חבירך!?
Why should the tzibur be forced to give up tachanun on his behalf? (see Shu"t Kinyan Torah 2:44)