I am a Turkish citizen and i live there so without the actual experience, most of the things said here is not true and heavily biased.
The people that got arrested last night were actively tied to terrorist organization called PKK and execute under their command. How would you feel there was a senator in your country representing such terrorist organization and continue to do so because he was untouchable because he was elected? How would you feel you left you house or dorm scared that you would be blown into pieces on your way to school or some errand etc?
Those people are widely connected and their supporters are trying to organize violent acts via social media.
Another thing is Turkey is %90+ muslim so It is very odd that people call Erdogan islamist. So what? It is a muslim country. People actually voted for him(including myself and most of the people i know). It is peoples beliefs. You dont say things about Obama or Bush 'Oh he is a Christian Leader' every time you have a conversation that has a negative context.