Yes; It's because you are biased.
https://hatepseudoscience.com/2016/04/12/understanding-bias-what-color-is-this-truck/
You see a statement like "23% said they would support there being areas of Britain in which Sharia law was introduced", and your brain goes 'WOW! 23% is a LOT!' - without for an instant considering that this implies that 77% said they would NOT support there being areas of Britain in which Sharia law was introduced - and 77% is a great deal more than 23%.
If 'only' 34% would tell the police if they thought someone they knew was getting involved with supporters of terrorism in Syria, that implies that if a radical has more than 3 mates, someone will likely tell the cops if they thought he was getting involved with supporters of terrorism in Syria. Bear in mind, most people (even white middle-class male adults) won't dob someone in to the cops on the mere
suspicion that they plan to commit a violent crime; and the question is even less clear-cut than that, as it says 'involved with'; that does NOT necessarily imply supporting nor joining with, and might just mean 'reading the blogs of' or 'chatting online to' - so 34% is a pretty large number, given the question asked. Notice also that the question only says '... if they
thought they knew...'. It's a question engineered to get a low response - and it STILL got 34% (more than one in three) saying they would report such activity to the cops.
I was going to ask "What proportion of the non-Muslim population do you think would report someone to the cops on mere suspicion that they were getting involved with violent criminals"? But then I remembered who I was talking to, so I will instead ask "What proportion of the population would a reasonable person think would report someone to the cops on mere
suspicion that they were getting involved with violent criminals"?
These figures simply do not constitute a cause for concern - unless you start from the perspective that there MUST BE cause for concern, and are simply looking for an excuse to continue in that belief.