彼には欠点があるから

because he has flaws

→ 彼
phrase Rare #39,957
because he has flaws Used to give a reason, often followed by a contrasting or emphatic expression such as なおさら, いっそう, or かえって. 欠点 means a flaw, fault, or shortcoming.
JA: 彼には欠点があるからこそ、親しみを感じる。
EN: Precisely because he has flaws, I feel a sense of familiarity with him.

彼には欠点があるから私はなおさら彼が好きだ

I like him all the more for his flaws.

彼には欠点があるからかえって好きだ

I like him all the more because he has flaws.

彼には欠点があるからいっそう私は好きだ

I like him all the more because he has flaws.

彼には欠点があるからなおさら好きだ

I like him all the more because he has flaws.