hmm didnt know we have a lot of engineers and experts in lyn. (for those that do not understand this is sarcasm)
i'm no fanboi, but bashing like this is unfair. Would be better if there's actual test done or any citation saying this weld would effect the integrity of the car.
(Such as part of the door flying out when driving 120kmh)

in my understanding the door is one of the crumple zone refer this diagram

http://www.bbc.co.uk/schools/gcsebitesize/science/images/ph_forces08.gif

the blue lines are the chassis; now the integrity of the car depend on this. IF a kapcai can damage the chassis (blue line) than by all means please bash.

btw Some people can afford imported cars some people cant.
What matters is how you drive.