Austen's sympathies were probably Tory like teh Country gentry as opposed to hte more liberal nad soemtimes louche ways of teh Whigs who were usually hte very wealhty peerage...

But these were not like modern political parties..not so rigid and not really about particular programmes more about a general attitude and one's own interests.

I think though that while the theatricals at MP are obviously a "bad thing" in many ways, in that they take over the house completely, the young people are using them as a cover for flirtation and possibly worse, and Sir T would disapprove.. I feel that Austen was here going through a period of being more serous minded than she had been previously. It is clear that Sir T would object to ALL theatricals.. especially if his "grown up daughters" were involved.. and Im not so sure that Mr Austen was so strict...as we know the Austens acted in plays at home.