> You can start having terrorist organizations that are able to obtain weapons with help from these billionaires to do acts that serve their agenda.
I lived in Sri Lanka during part of its civil war. It started as a terrorism, The backing came not billionaires but ordinary people: rising ethnic tensions caused by terrorism increased the support the separatists had, and an overseas diaspora able to fund them was hugely expanded by people fleeing the civil war - and became more willing to do so in reaction to race riots and the like.
> If a Billionaire finances the shipping a few thousand rifles and explosive to UK in drug induced rage night, will the UK politicians and law enforcement or the intelligence services be able to do anything about that?
I think they would. its a crime, and its very hard to maintain secrecy at the scale needed to distribute large numbers of weapons.
The IRA had thousands of rifles and stocks of ammunition. Islamic terrorists have billionaire backers. Neither has been able to scale up beyond bombings and similar small scale attacks in mainland Britain. The IRA were able to in Northern Ireland, but that was with a large proportion of the population backing their cause (though not necessarily their use of violence).