ok no disrespect to anyone here, but if you really want to get into it, where does it say in the Guru Granth Sahib that we needed khalistan, did Guru Gobind Singh say we needed khalistan?, he said Khalsa for sure, not khalistan. Khalistan is a product of modern sikhism, there is nothing in the Guru Granth Sahib saying we need a seperate state, infact the guru's teachings point more towards staying together and treating everyone equal, not dividing up. The same applies to tattoo's a product of modern sikh interpretation. Tattoos dont hurt anyone, if the tattoo of religious text is on your body, then it MAY serve as a reminder that there is someone more powerful then you and you have to abide by his rule. Tattoos arnt the same as cutting hair, im sure you can get a tattoo done by someone who will not cut your hair, and if some hair comes off by accident then I really dont belive its your fault, because scratching your beard or head can also make hair come out, will god punish you for scratching your beard? Thats a desire isnt it? Also, lets move on to surgery, removing tumors and perhaps even limbs (MAJOR BODILY ALTERATION) would god get mad?, i personally think not. Elements in Sikhism are very important and some arguably more important then others. I.E tattoo's (non hair removal by purpose) would not be as much as an influence as donating to the poor for instance.
Thats my opinions, just throwing it out there for you guys, again no disrespect.