Are americans becoming more biased or has certain events made them angry and concerned. Bias implies an unfair view or prejudice but I think many are worried about religious extremism and surely they have that right based on events.
Here in the UK.
http://www.bbc.co.uk/news/uk-31794599
http://www.express.co.uk/news/uk/565306/Muslim-prisoners-double-in-Britain-s-top-terror-jail-and-foreign-nationals-up-by-a-third
https://www.theguardian.com/uk-news/2016/apr/11/british-muslims-strong-sense-of-belonging-poll-homosexuality-sharia-law
Ultimately I think many of these issues aren't being addressed by politicians because of political correctness in the UK leading to frustration in the wider population.
I honestly think the prejudice and problems are in the muslim community and the issue is how we improve the situation so less muslims commit crime in general including hate crimes etc. We need more influence in their lives/culture to make sure young muslims are bought up with respect and tolerance for women, gay people and other religions in general. We need them to understand that religious people deciding the fate of others often with cruel sadistic punishments i.e. sharia law is totally unacceptable. The majority of muslims already feel that way but a huge sizable minority do not and this is unacceptable.
