That political stability is vital for investment and development goes without saying, but it seems as though too much instability can be bad for criminal enterprises too.

The cocaine cartels that used West Africa, and Guinea-Bissau in particular, as a conduit to Europe were long accused of worsening the chaos in one of the region’s poorest and most troubled states by buying off some factions of the security forces and political leaders.

But if so, things may have gone too far.

In less than a year, Guinea-Bissau has lost President Joao Bernardo “Nino” Vieira (dead), the head of the army (dead), the head of the navy (fled), a former defence minister (dead) and a candidate to replace the slain president in the June 28 election (dead). And those are just some of the figures at the top.

Whichever of Guinea-Bissau’s leaders might have been involved in the drugs trade and which were trying to fight it, the removal of such a swathe of the leadership appears for now at least to have knocked the traffickers off balance too.

Drug smuggling through West Africa has plummeted, according to the U.N., despite the fact that its geography also makes it an ideal bridge between Latin America and Europe.

“The fact that big traffickers do not any longer have certain partners in power clearly have disrupted the routes,” said Antonio Mazzitelli, regional head of the United Nations Office on Drugs and Crime. “A trafficker would never bring 2 tonnes of drugs to a country where he is not sure he can operate,” he told Reuters.

Political changes in Guinea, where a junta seized power after the death of President Lansana Conte, and Ghana, where the opposition won a democratic election, also appear to have limited their use as smuggling conduits for now.

An election in Guinea-Bissau now offers a chance for a new start. With greater international support its chance of becoming a failed state could have improved.

A question for the West African countries – and for the drug traffickers – may be whether administrations that become more entrenched over time will more easily fall prey to the lure of the drug money despite the dangers.

“Nino” Vieira’s past as an old soldier was never far from the surface. It can have surprised few in Guinea-Bissau that the old coup maker’s death came at the hands of troops who turned against him in a country perpetually on the edge of failure because of military squabbles driven by centuries-old ethnic rivalries and the newer influence of drug smuggling cartels.

Covering the campaign for Guinea-Bissau’s first multiparty election in 1994, I found President Joao Bernardo Vieira far from being the most talkative of politicians. Sometimes actions said more. After one campaign stop, and in view of attendant dignitaries, Nino grabbed a military aide by the ear after he had caused offence and twisted it until he squealed in pain.

President Vieira emerged in the 1960s and 70s as one of the leaders of the fight to drive Portuguese colonialists from Guinea-Bissau, a country of swampy inlets, a scattering of islands and a scrubby interior that sent little to the outside world but cashew nuts - before the coming of drug traffickers in recent years made cocaine a more lucrative export for the few involved.

Vieira seized power in a bloodless coup in 1980, took Guinea-Bissau away from a Marxist path and was elected in 1994 when donors started demanding democratic reforms across Africa. Trouble came when he fell out with an army chief in the late 1990s, prompting a rebellion that forced him from power.

He returned in 2005 and was elected president, but there was no end to the instability. In November last year, he came close to being killed by renegade soldiers. In January, Vieira’s militia was accused of trying to assassinate army chief General Batista Tagme Na Wai. Na Wai was killed on Sunday, hours before Vieira’s death in an apparent revenge attack.

Na Wai was among the soldiers who toppled Vieira in 1999, but their differences went back to the struggle against the Portuguese. At least part of the animosity appeared to be ethnic. Na Wai was from the Balante, Guinea-Bissau’s biggest group, from the rice growing lands of the interior. Vieira was from the Pepel, a small coastal tribe.

The arrival of Latin American drug cartels has been another cause for tussles within Guinea-Bissau’s hierarchy. The weak state, unpatrolled coastline and proximity to Europe have made it an ideal staging point. Whether or not any faction has tried seriously to stop the trade is unclear, but it has certainly fuelled the power struggle.

The question now is whether Guinea-Bissau has a chance for a new start or risks plunging back into turmoil? Will the international community care enough to do something about the troubles in a country with few resources to interest the world? What will it mean for the drug cartels?