why datta came back to PN

Datta came back to PN to prepare his full-fledged battle against anna.

To show(for audience) how deep his love for nakku and how he is longing for nakku.

AND

Everyone in the PN will know that Datta never been angry like this before not even during marriage but Kala will try her best to stop datta by saying that you can't risk you life right now you out of danger. You should not risk your life for nakku. She will cry and say that we are nothing without you think about us and AS. Eventually datta will say I am nothing without nakku. And he openly says that he is in love with nakku. He will say that I will risk my life for nakku.

It will be nice to see a horror struck face kalavathi &co.

Everyone in the PN will know that datta was totally in love with nakku and no one can stop him.

Kala & co will realize that they had dig out a big hole for them.

hope he says it front of his family.

i think even kishore must encourage dutta to go and save nakku..he should be saying "tum ne bilkul theek decision liya hai dutta..nakku ne tumhein har waqt bachaya hai aur iss baar tumharo zimmedari hai ki tum APNI patni ko bachao.."i would love to see kishore thowing such lines...

he beahved very wildly when he came to knw that sups had elped...how he threw thinhgs..n all..but now...he had the [V]devastated and frustrated look on his face then
but now he himself said that is jungle ne mujhe shant kiya hai..so his reaction is much diff now..tho he is VERY VERY angry on anna...his anger and concern will make every1 understand how much he loves naku...

Sasha u have put it so nicely. i thought its an article and not ur thoughts...lol