Theres a person who is curious and does something wrong and regrets it, and then there is another person who commits the same sin again and again without actually trying to conquer their vices/temptations.
Doing something wrong and not feeling any shame or regret after doing it is possibly the worst state one can be in.
There are people openly engaging in adultery and feeling absolutely no shame or regret at all. There are "Sikhs" making money out of fraud, using fraud on their own people to make money, abusing the trust of their own people. There are people out there who are really envious of other peoples success and in their hearts wish for something bad to happen to them. Some people have such a huge ego!
So many different ways of sinning ...
The sakhi of Bhai Bachittar Singh starts of with Guru Ji asking which Singh is going to tackle the Mughals and some Singh, forgot his name, egoistically said he can face the Mughals, he was huge, really tall man. He went boasting around taking pride in his size/strength that he can defeat the Mughal army. When the Mughals sent a intoxicated elephant charging towards the Sikhs, that same Singh was the first one to do a runner! everyone was like wheres he gone! and then Bhai Bachittar Singh who actually was a very short Singh and skinny volunteered to tackle the elephant.
Once Guru ji hugged and praised a young Singh who was a teenager, one of the Singhs who was a little older than him got jealous and hit the young Singh on the face and sent him crying. That's jealousy and anger ...
Everyone has a weakness, whether if it is greed, jealousy, lust etc ...
But its still the same stuff though if you think about it. s3x with prostitute and premartial s3x with your gf, either way its still a sin lol.
So Sikhs committing sins today is nothing new because even during the times of the gurus they were committing sins.
But that obviously doesn't mean its Ok to do wrong stuff. Self restrain is very important.