The love is understandable

The Supreme One’s avataras occurred because of His own

volition, unlike human births, which occur due to karma.
Even when He was on this earth, the Lord retained all the
qualities natural to Him as the Supreme One. And yet, He
was accessible to all. That is why His bhaktas love Him.
Their love for Him is understandable, said M.K. Srinivasan,
in a discourse.

They are unable to live away from His divine presence.

And what does He give them in return? He gives them the
indestructible prosperity of moksha. He is easily pleased.
One can offer Him a flower, or a slice of a fruit, or even a leaf, or a spoonful of water, and He happily accepts any of them.

Tiruppanazhvar in the first verse of his work-

‘Amalanadipiran’- uses four words to describe Lord
Narayana. The Azhvar says He is Amalan- One who gets rid
of the demerits of others; He is Vimalan- One who is
Himself blemishless; He is Nimalan- One who has no
consciousness of His supremacy, and moves freely with all;
Nirmalan- One who ignores the faults of His devotees.
He has two significant qualities. He has a natural
compassion towards all beings; He answers the specific
prayers of His devotees, and out of His compassion He
grants them moksha. His devotees feel at ease in His
company, and He and His devotees are inseparable, because
He establishes close congeniality with them. His greatness is
without limits and without measure. He is the One who can
give us moksha and liberate us from samsara. And yet He
befriended the humble and even became Arjuna’s
charioteer. He welcomed Vibhishana to His camp, although
Vibhishana was a demon and the brother of Ravana. Is it any wonder that His qualities attract His bhaktas?