Not trying to be rude here, just giving my point of view, but, I am so far to be agreed with you here, as a web dev or just as a dev you should always consider writing your code in a way that it doesn't break "the train", hiding the possibility of making bugs due to you are just a web dev is a very poor excuse. From my point of view, thinking in that way ends in having bugs over bugs into the projects.
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Not trying to be rude here, just giving my point of view, but, I am so far to be agreed with you here, as a web dev or just as a dev you should always consider writing your code in a way that it doesn't break "the train", hiding the possibility of making bugs due to you are just a web dev is a very poor excuse. From my point of view, thinking in that way ends in having bugs over bugs into the projects.