Domestic lone wolves could destroy Asgardia in a single explosion before they even raised an eyebrow.
Another reason why it's f'kin stupid to think of only ever building one. There's lots of lessons available for the learning, to the observant. One is the importance of multiple backups in geographically remote locations. Assuming you care about it being there tomorrow. If you don't learn this lesson from observation, then you will learn it from loss - and ideally, observation saves the inital loss.
But, that said, explosives... on a space station... Even if the inner pressure hull resisted the inital kinetic and thermal transfer - one I'd design would be looking to eat the forces applicable from the yeild one person could feasibly conceal - and was to survive the sudden adjustments in pressure, it's unlikely the organics will. I can't build a system that could adapt fast enough to cope. Maybe fast enough to not kill everyone, everywhere, maybe leave them deaf or something as the pressure rose fast enough to burst their eardrums but dropped quick enough by already lowering the pressure before the wave arrived to save their lives but there'd still be those closer with liquified internal organs from the pressure wave etc. and in a sealed box this would be really easy to do. Perhaps by the time this is happening it might be possible, or someone else would have a better idea of "how" but, the general environmental support systems are more likely than not to depend heavily on a massive sensor network. This is incredibly likely to include air quality measuring. To the point where one atom in ten billion atoms or more is detectable. This sort of system is already in use for detection of explosives - and can be sensitive enough to pick up that someone has been in contact with. People can have two perfectly harmless chemicals under their sink, the second they mix them, the environmental support systems should be aware. This should cover a lot more than explosives, too. For example a seperate subsystem is likey to be monitoring this data in order to track and mitigate infection spread. Kitted thusly, It should be difficult to get into a facility with - and Earth-based facilities already use such technologies so they shouldn't even get on a transport - and they should make equallly difficult to manufacture on site. The only obvious failure here would be places that natively have this chemical signiture blacklisted from alert states due to things like this is where it is stored, or used in some particular legitimate process. I can't imagine there would be much call for explosives use in residential facilities tho so it's possibly not a concern for here. Surely these would be stored elsewhere. The general damage possible to be caused by a "lone wolf" should be natively limited by sensible systems design, any attempts noted and in most cases directly compensated for by the "AI".
Generalised travel ban most unlikley. We should have no excuses to "act on fear" or to attempt to "rile people up" ergo exhibition of such behaviours isn't likley to favour much in the way of generalised support. Specific travel ban on individuals is a sincere possibility but I'd like to think there would be some genuine and applicable reasoning applied.
Attacking "ships going up" is definitely the "weakest link" - with chemical rockets that's a lot of bang sat in one place. A lot of fragile bang. There are many low tech and high tech methods to cause RUD. When it's quite close to the floor, it's "easy" to get to, big heavy things take a little while to speed up. Once it gets seriously moving, however, it should be difficult to catch.