It's complicated man. It's more of geopolitical than religious war. And Muslim countries are doing and helping America and it's allies all they can. Qatar, UAE, Jordan, Egypt all of them were bombing ISIS. It's a well known fact. The guy who ISIS burned him alive in the cage was a Jordanian pilot. So of course Muslim countries are fighting with them.
To answer your second question about ''Whey do Western GOVT have to clean up the mess for them? I don't know mate if you've been in a comma for last 15 years or not, but anyway here's something that you seem to not totally aware. Reality is that we've had just as many bomb attacks that killed people in Germany, France, Sweden, or any other European country in the last ten years as what Syria had in the last ten years before America started giving terrorists weapons to attack people in Syria. I find it funny how everyone agrees that we need to confront Islamism yet Western governments do the exact opposite. Regime change in the Middle East removes strong leaders who protect secularism and know how to keep Islamism in check. Number of Suicide Bombings Around the World Surged 94% in 2014. http://www.haaretz.com/news/diplomacy-defense/.premium-1.635193 In Iraq, there were zero suicide attacks in the country's history until 2003 when America invaded. Since then, there have been 1,892. In Syria, there were zero suicide attacks in the country's history prior to 2012. In Libya, there were zero suicide attacks in the country's history prior to removing Gaddafi. In Pakistan, there was one suicide attack in the 14 years before 9/11. In the fourteen years since, there have been 486. The so-called war on terror and forced regime changes created Islamist terrorists where there were none before and made the world a much worse place.
Whether the Western intervention in those area was meant to be a good intention or not, Western governments that created the circumstances for this cluster fuck...the British, French, German and american government all ploted the attack and destruction of Libya. This is where the boarders have been breached. This is where countries have been destroyed and the terrorists from the broken countries are joining the exodus. Gaddafi knew those fuckers and tried to warn us, but nobody listened the man. We shoulda let him have his virgin bodyguards and all, cause that was way better than those ruthless cold blooded sick fucks.
Source for statistics: Suicide Attack Database http://cpostdata.uchicago.edu/search_new.php