Why Shivsena like this?

I saw in news that the workers(goons) of Shivsena forced a newly married girl to tie the rakhi(tying the rakhi girl to boy signifies brother sister relationship) her husband so she tied that she might not be beaten by the worker (females). It seems that Shivsena is more danger than alqaida. Isn't it ? By the way that time was valentines day. I don't know why Shivsena has this kind of sadistic mentality?