I wouldn’t paint the entire following of Sikhism by the actions of a couple or even a handful of Sikhs.
Quite right. Sikhism has its extremists, though they never went after the West. They’ve lost a lot of influence in recent years.
The most idiotic part here is the claim Sikhism is a “religion of peace.”
The truth is that Sikhism is quite explicitly a warrior religion, at least as much as Islam is, though dedicated to the protection of the innocent (at least in theory) rather than the imposition of their Law on others.
Islam says, “We will fight you till you submit.”
Sikhism says, “We will cheerfully coexist with you in peace unless you attack us or other innocents. If you do we will rip your face off.”
Sikhism is explicitly dedicated to tolerance of other religions.