LogFAQs > #912656050

i think the implication was Goku had a choice and because hercule and dende were right in front of him, his nature kinda instinctively made him help them. at which point he flet he wouldnt have enough time to perform two instant transmissions. (one to go to where Gohan and the others were, and another to escape the planet)

but yeah the writting in DB has never been all that great. theres a ton of inconsistencies everywhere if you look. but honestly Superman might be even worse in that regard, although it is partly due to being handled by a lot of different authors.