Exult

(Proverbs 28:12 KJV)  When righteous men do rejoice, there is great glory: but when the wicked rise, a man is hidden.

This is a verse where the KJV comes closer than the modern translations.  They tend to translate “rejoice” (5970) as “triumph”.  A better word for modern times might be “exult”.  This is not the simple process of being thankful in times of stress.  It is not making lemonade from lemons.  This is an attitude that people have, not when they see the righteous triumph, but when they see righteousness triumph.  This is the celebration that comes when you see wrongs being righted and evil being thwarted.

So?  It is okay to celebrate when the good guys win.  I realize that there will be some variation in what your issues may be and what needs to be fixed but there should also be a very large area of agreement.