At its heart is loyalist anger at post-Brexit trading arrangements that have created economic barriers between the region and the rest of the UK.
For loyalism, Brexit's Northern Ireland protocol has undermined their place in the Union.
But it took an event unrelated to the Irish Sea border furore to set a match to resentment that has been simmering since the consequences of exiting the EU became a reality at the start of January.
The announcement by prosecutors last week that no action would be taken against 24 Sinn Fein politicians, including deputy first minister Michelle O'Neill, for attending a huge republican funeral during the pandemic sparked outrage among some loyalists.
In several loyalist working-class areas, many still in the grip of the malign influence of paramilitary gangs, sporadic rioting has since flared.
Belfast, Londonderry, Newtownabbey, Carrickfergus and Ballymena have all witnessed scenes of violence that many hoped had been consigned to the history books.
There have also been bouts of disorder within republican areas in recent days.
In the starkest, youths on both sides of a west Belfast peace line pelted petrol bombs and other missiles at each other through Wednesday night.
For loyalists, the funeral of former IRA leader Bobby Storey last June hardened a long-standing perception held by many within their community that the institutions of the state afford preferential treatment to republicans.
For apparent confirmation, they pointed to police engagement with the Sinn Fein funeral organisers prior to an event that saw around 2,000 people take to the streets of west Belfast when tight limits on public gatherings were in place.
This interaction with the planners was one reason why senior prosecutors concluded any prosecution of Ms O'Neill and her colleagues was doomed to fail - the other being the "incoherent" nature of Stormont's Covid-19 regulations at the time.
Criticism of the PSNI approach was not confined to hard-line elements within loyalism and all the main unionist parties subsequently called for chief constable Simon Byrne to resign, claiming he has lost the confidence of their community.
DUP first minister Arlene Foster has said she will no longer engage with Mr Byrne.
Her lack of communication with the region's police chief during a time of escalating street violence, and comes only weeks after she met with representatives of loyalist paramilitaries to discuss the Brexit fallout, has drawn sharp criticism from political rivals.
Non-unionist parties have accused Mrs Foster and other unionist political leaders of stoking up tensions, not only in relation to the Storey funeral but also in respect of the Irish Sea border.
The DUP leader and other prominent voices within unionism and loyalism insist they are only reflecting genuinely held concerns they say must be addressed - specifically by way of Mr Byrne's resignation and the binning of the Protocol.
Amid the current unionist clamour for Mr Byrne's head, and claims of "two tier" policing, it is worth noting that two months ago the PSNI chief constable was facing similar claims of discriminatory behaviour from within nationalism.
Those were prompted by a controversial police operation in Belfast that saw a man badly injured in a loyalist gun massacre during the Troubles arrested at the scene of a commemoration event after officers intervened to probe suspected Covid regulation breaches.
Following that incident at the site of the 1992 Ormeau Road betting shop murders, Ms O'Neill claimed there was a "crisis in confidence" in the PSNI among nationalists, albeit she stopped short of calling for Mr Byrne to quit.
The protocol and funeral controversy has not created the loyalist perception that the system is weighed against them, but have built upon a narrative articulated by an increasing number within loyalism that the peace process - particularly the Good Friday accord of 1998 - has handed them a raw deal.
They cite underinvestment and deprivation in loyalist working-class areas as further proof that they have missed out on the gains of peace.
Nationalists and republicans reject this premise, insisting their communities have experienced just as many problems with poverty and unemployment since the signing of the Good Friday Agreement.
Paramilitary elements are undoubtedly involved in much of the disorder witnessed across the region in recent days - either directly or by orchestrating young people to riot on their behalf.
However, in Newtownabbey and Carrickfergus an added factor is at play.
In those areas, the PSNI believes paramilitary involvement is less motivated by Brexit or the Storey funeral and more to do with a rogue faction - the South East Antrim UDA - reacting to recent police operations targeting its criminal empire.