Ofcourse! Our sympathies lie with the innocent mother of two children, but this incidence has nothing to do with Sikh values and principles... did he cut her hands as per some commandment in Sri Guru Granth Sahib ji, the only Sikh Guru?
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/islam/29177-want-to-kill-get-away-impunity.html
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=29177

If you search SPN archives then you would fine umpteen topics where SPN has raised voice agsint social evils like this --> http://www.sikhphilosophy.net/spn-fo...womanhood.html, where atrocities against women are condemned whether inside Sikh religion or outside the scope of Sikhism...

What is your point of asking the question, really?

Regards