I'm sorry for your loss, but situational awareness is not quite the same as paranoia.
Most equipment theft seems to be urban-based, and there are some cities with long-standing problems ~ think Port Harcourt (Nigeria) , Kigali (Rwanda), Jakarta (Indonesia), or the NE banlieues of Paris. In some areas, the problems are dynamic; they come and go. Notting Hill and the Bronx seem much safer than they were 20 years ago.
There will be circumstances where you're gonna get robbed, no matter what. But most grabs are opportunistic. And this is where common sense and local knowledge can mitigate the problem. In any strange city, it's worth checking your hotel reception or a friendly local to establish what areas can be problematical. You might also want to be discrete in flashing expensive kit in dodgy areas. Anonymous bags are a useful precaution, too.
In 20 years on the road, I got robbed just once - and that was at a Serbian checkpoint in Banja Luka. You don't argue with AK47s with taped magazines. But my Omega Seamaster was under the Landrover seat; they took the cheap substitute Casio I'd quickly bolted to my wrist. Curiously, they ignored the professional camera kit - an Ikegami, Angenioeux lens, mics and mini-mixers are not readily resellable.
Common sense will see you through 97% of foreign travel; relax and enjoy the experience. If bad things happen, they can happen anywhere.