Liked freedom fighter

We know Lala Lajpat Rai was a very great freedom fighter who belonged to the Extremist group of freedom fighters. Although his approach to the Britishers was very violent, the Britishers liked him a lot. Why?

Lala Lajpat Rai was "Punjab Kesari". Since, he was a 'sweet' person, the Britishers liked him.