Of course bitcoin is being used for illegal activities. And as has been pointed out, fiat is used for illegal activities also.
The difference between bitcoin and fiat being used for illegal activities other than the fact that fiat is used more so for illegal activities, is that the press and media actually blame and demonize bitcoin for the illegal activity. Why? Because that's what sells and brings in the ad revenue. Every day there are hundreds, if not thousands of illegal activity uncovered using fiat currency, but who really cares unless there's some compelling, enthralling, captivating story to it?
However, if it is some illegal activity involving bitcoin, then BOOM! Instant headlines. Bitcoin + [insert whatever illegal activity here] Read/watch more to find out how evil and terrible bitcoin is because it was used for this otherwise common, run-of-the-mill illegal activity that has been committed many many times in the past with good and righteous fiat currency.
The bitcoin is where all countries can send the trash news,all bad news will be turned to bitcoin,instead they put their fiat thats is what leads the ilegal stuffs,they wanna hit bitcoin making people just thing hey ,only that coin is being used to that things,our dollars,eur doesnt do that anymore they changed the way they work.... no one will really believe ,politicians still what fiat or bitcoin?Media are being paid to try to kill bitcoin with such news ,the fact is that fiat is the currency number one and there wont be any competitor being it use for good as for bad .