Do you think aggression is a must for any successful project? Or can you entertain the possibility that projects might progress even further and faster without it?

You point to Linux but assume that Linus' infamous foul behaviour has been beneficial. This is a very basic confusion of correlation and causation.

You suggest that being "welcoming" is antithetical to "success" without defining "success".

Also, note what the "B" stands for in BDFL.