Rajendra chola, following is what i have understood.
the 'puthir' is rephrased into two questions.
1. why Rajendra chola did not stop Sultan of Gazni ( a.k.a Mohammed of Gazni - ( who will be referred further as MG) from destroying hindu temples.
2. Why didn't sultan of Gazni go further south and attack Southern kingdoms ( or did he go south? )
For the first question,
Mohammed of Gazni (MG) did not conquer a place and ruled there. He was never interested in ruling the regions. He just wanted to (i)loot all the valuables from India and (ii)change hindus to muslims. He raided 17 times but never satyed in those places. It was just like a visit if i read things correctly. In that case,
it gives very little time for any king to organize force to stop him doing that, particularly Rajendra Chola. who, eventhough ruled until Ganges, was having his capital at Gangai konda cholapuram, way south of Gujarat and was also involved in his own battles to occupy maldives.. Only after Mohammed of Ghori, did muslim rulers start trying to rule the parts they occupied and have succeded. Also, we should bear in mind that eventhough Kundavai ( daughter of Rajaraja chola) was married to a eastern Chalukya ruler ( Vimaladitya )and Rajaraja helped him establish his empire within chola dynasty there were skirmishes in the western part ( Deccan ) from the western chalukyas. This presence of western chalukyas might have prevented rajendra from knowing the happenings of Gujarat.
The answer to the second question needs some explanation.
Among the 17 radis made by Mohammed of Gazni, 6th and 16 th are considered to have greater significance.
The crowing exploit of Mohammed's career was the plunder of the great temple of Somnath (1026) in the extreme south of Kathiawar ( gujarat). It is reckoned as his sixteenth expedition. WHEN Mahmud Ghazni was returning from his sack of Somnath, he had decided to take the Sindh route(*why sindh route*). The return journey from Somanath was a severe trial to MG. His army suffered badly from want of water, and was harassed by the predatory tribes of Jats. It is to punish the Jats in the neighbourhood of Multan that MG led his last (17th)expedition to India (1027). He really struggled to win these Jats. Having chastised the enemy MG returned to Ghazni. He suffered a huge loss in terms of military reources in this 17th expedition. Later his life was much spent in domestic problems until he died in 1030.
* why sindh route* The `religious' reason for the expedition was that MG was a Sunni, attached to the Khalifa in Baghdad, and the Muslims in Sindh were inclined towards the Karmatian Shia rulers of Egypt, who had even carried away the black stone of Kaaba. The Karmatians in India were half-Hindu; they looked upon Ali, the son-in-law of Mohammed and fourth Khalifa, as the tenth avatar of Vishnu!. MG really hated this and wanted to teach them a lesson.
I hope this also throws some light ....
Btw, I am Manikandan, from Washington DC, another ardent fan of PS, to introduce myself.
There is mention of Murka Arabiyar Kootam in Akilan's Vengaiyin Mynthen. Also probably Rajendra Chozan was busy with preparations for restoring the mani magudam of Tamil Kings ( REad Pandiyan) that was hidden at Srilanka, which he thought was of much more importance to tamil people than preparing to fight Gazini. Moreover Rajendran's daughter Chiriya Kundavai had married Vimaladityan, so rajendran wuld have surely been aware of Gazini, but he would have probably wanted to consolidate his position in south rather than stop Gazini, who any way cld not proceed further and had to stop at orissa border.