They will still steal your seat, lights, wheel, and any other bit they can get.
Sure you can use all number of locks, security bolts, and stripping the bike down yourself every time you leave it, but it’s sucks. You’d rather public spaces just be safe.
Just follow the old Eve online adage - don't fly what you can't afford to lose.
If there's lot of theft and you can't store bike at a secure place - have a cheap bike.
Yes that's the compromise we have had to live with. But some countries like Singapore and China are showing it is actually possible to just solve theft so you don't have to deal with your bike being stolen.