Love

According to traditions, both from the Shia and the Sunni sources, it is established that love protects one from being a slave of one's desires and Shaitan. This is because the love of an exalted personality entails that we also love his friends and hate his enemies. The friendship of Shaitan and the following of one's evil desires are two of the biggest hurdles in one's love for Allah and the Ahlul Bayt (a.s.).

Insha Allah the followers of Ali (a.s.), by the blessing of his love will remain away from the path of Shaitan. Thus, love (for Ahlul Bayt) protects one from evil rather than make him susceptible to sins. In order to explain this idea a few traditions are mentioned below: 

Love Makes a Man Steadfast

Imam Muhammad Baqir (a.s.) has said,
"Whoever has been bestowed the love of Ali (a.s.) in his heart by Allah, is not prone to wavering (from his path) but he becomes steadfast on the path of Allah) and also towards other (matters)."
(Behaarul Anwaar) 

The Testimony of Jabir Ibne Abdullah Ansari (r.a.)

Hazrat Jabir ibne Abdulla Ansari (r.a.) says: If the first step of the lovers of Ahlul Bayt (a.s.) is in the wrong direction due to excess sins the next step is guided aright by (the grace of) their love.
(Safinatul Behaar) 

The Angels Seek Forgiveness for the Partisans of Ali (a.s.)

According to the traditions of the Ahlul Bayt (a.s.), it is an established fact that even the angels ask forgiveness (on behalf) of the followers of Ali (a.s.). A tradition is quoted in Behaarul Anwaar from the Sunni sources in this regard. Anas relates from the Holy Prophet (s.a.w.s.) that he said,
"Allah has created seventy thousand angels from the light of Ali ibne Abi Talib's face. These angels will (continue to) ask forgiveness (on his behalf and on the behalf of his devotees) till the Day of Judgement." 

Devotion for Ali (a.s.) Consumes Our Sins

The love and devotion for Hazrat Ali (a.s.) destroys one's sins as is proved by the numerous reports. Behaarul Anwaar has the following tradition related from the Holy Prophet (s.a.w.s.) by Ibne Abbas (r.a.):
"Love of Ali (a.s.) consumes the sins like fire consumes wood."

There is a Persian 'Qata' (four-line poem) which summarises this discussion as follows:
The love of Ali (a.s.) removes the darkness of the heart like the moon and the stars illuminate the night. Salvation will be based on ones love for him and not ones worship deeds.

But those who are his devotees, must also rely upon the Merciful (God). We should not be satisfied only with this devotion and forget Allah.