To be honest, that there hasn't a string of successful muslim attacks at the ground level (a few spread out isn't a string) since makes me think 1 or 2 of 3 things is the case:
1) the DHS/FBI/NSA etc. are REALLY FREAKING GOOD (unlikely)
2) there's really not as much of a domestic threat as we have been kowed into believing there is
3) or they're REALLY BAD at being terrorists.
Given they're REALLY GOOD at being terrorists in the Middle East, the latter of the 3 is less likely. Given that there's been very few "we stopped em!" incidents (and very few successful attacks), I doubt that 1 is likely. That leaves #2 as the most likely.
No IEDs going off on the 5 freeway at rush hour (any idiot with internet access can build one), mass shootings are fairly ineffective compared to a bombing and given how rare they are compared to ability ..., etc.
http://www.johnstonsarchive.net/terrorism/wrjp255a.html
look at the link since Sept 11 and focus on the Islamic ones. All really low grade BS for the most part.
Biggest ones were Nidal Hassan, San Bernardino, Orlando Florida (which was really effective, but they were fith in a barrel), and that's it for deaths in any appreciable number.
NYC in Sept 2016 has 29 injured, so they made a valiant attempt but we should be seeing such effectiveness a lot more if the threat was really there in any appreciable level -- particularly for the $ spent on "fighting terrorism". I simply cannot believe the various agencies are THAT effective at prevention.
The terries are much more effective overseas with small teams. They're not any smarter overseas. The cost of bomb making materials to have IEDs all over the interstates and in shopping malls can be purchased on a 7/11 clerk's salary.
Just doesn't make any sense.