Why is this FB group, supposed to be for friends of SPV, refusing free clash of ideas?

AK Joti, Shalini Randeria, Pratap Bhanu Mehta

I posted the link  of my Counterview blog titled "Nothing wrong in calling Amit Shah, but will this top school also call Rahul or Kejriwal?" on a Facebook group called Sardar Patel Vidyalaya Friends of which I am also supposed to be a member. I say supposed to be because no sooner I posted the blog, it was removed -- straightaway. 
The message removing the blog said the an admin had removed it. I don't know which one, but it sounded strange, to say the least. I wrote in my blog that the spirit of free, democratic thinking of SPV shouldn't stop at asking Amit Shah, Union Home Minister, to address the children. Why not also call a Rahul Gandhi or an Arvind Kejriwal too?
This made me scan through the FB's SPV group. While most posts were of general nature, a few of them were politically inspired. The entire speech of Amit Shah found its way -- as uploaded by the Haryana BJP -- in the group. There was another post which called names like "tukde-tukde gang" close to Pratap Bhanu Mehta seeking to grind its political axe.
It is this group, it said, which behind the letter written to the school management not to call Amit Shah, whose ethos allegedly ran against the Constitutional spirit. The post went all to find Khalistani links of this gang, stating, there was "definite information" that many of its members have returned to India. Great piece of news!!!
I don't see anything wrong that such posts are allowed to appear in the FB group. This is just one viewpoint. But why not allow others too to express their views? The letter writers have been criticised for "carrying on the same false anti-Modi propaganda that was started by Teesta Setalvad and Sanjiv Bhatt 20 years back." Okay. But why let others, who are also alumni, to express themselves?
This post stated that some of those called to address the school children in the past included well-known academic Pratap Bhanu Mehta, who was "kicked out" as vice-chancellor of the Ashoka University, insisting he is "anti-national". Then, the author of the post wonders why AK Joti, IAS, a 1969 batch alumnus of the school, a "true nationalist" who became chief election commissioner, was left out.
We journalists in Gujarat surely know Joti very well. He has loved to toe the Modi line, come what may. Not nationalism but toeing a particular line helped him -- who doesn't know this? Ask any journalist covering Gandhinagar Sachivalaya during the days he was chief secretary under Modi.
Then there is another person mentioned -- Prof Shalini Randeria, currently a top-notch sociologist in Europe. I have reported her research work on Gujarat Dalits. A 1971 batch alumnus, perhaps this FB group person doesn't know her, lest she would also have been dubbed anti-national.
It's ok if you dub anyone anti-national for her or his thoughts, which is what Amit Shah and Narendra Modi have been doing, calling "urban Naxals" all, left, right and centre. But at least be faithful to the SPV spirit... Let opinions clash...