Sikhism is a religion based on hatred of others (mostly Hindus and Muslims).
Like any other belief system it is a waste of time and divisive of humanity.
The Sikh Gurus started Sikhism because they were greedy for power and wanted the peoples following to overthrow the Mughal state and rule, some of them got executed for treason and rebellion in the process which further strengthened their cult and they were hallowed as martyrs by their followers.
There's nice things in Sikhism but like any other religion there's not so nice things too... It's an amalgam of good and bad, logical and illogical, rational and irrational... Sikh proselytizers will only highlight the good and try to explain away the bad.
It's liberating to break free from the shackles of religion having moved away from family... As a young man I wasn't even allowed to have a haircut or shave like my friends, I don't wish that on any teenager.
Religious symbols or iconography is socially divisive and should not be tolerated in public, people should only practice religion on their own private properties.