Inevitable over time. I have never needed anyone to tell me how to care/clean my boat. Ironic how this was never an issue years ago when you could launch anytime anywhere and now with governing measures in place we have all these problems... $$$
umm... years ago there weren't all these invasive species being moved around because... there weren't all these invasive species being moved around. ta da!
really, being long term oriented and paying attention to history the only way to stop major movements of invasive species you'd pretty much have to stop people from travelling and also stop all international trade and then keeping birds, fish and any other animals isolated to regions they inhabit. which anyone who studies nature knows that doesn't happen and isn't possible, but the thing is, over millions of years the planet has set itself up to do these sorts of things on it's own it is just that humans continually accelerate those changes and the amount of change looks like chaos and systemic overload as the regional changes happen so quickly that it's just a huge mess which is very destructive to native species.
if you want specific examples you can look at what has happened with thistles, soda apples, fire ants, crazy ants, many other insects, asian carp and of course the topic of this thread...
how to prevent random damage is to travel as little as possible with as little containers and extra things as possible. when hiking don't take your favorite toys, be minimalistic and only take what is absolutely needed and this way you have less to keep track of and to round up when leaving. if needed a mental checklist (no extra paper

), but of course also make sure to be safe and have enough supplies plus extra just in case. yes, this is something that involves balance and judgement, but it also helps a lot for people to be mindful of what they are doing and to think about what impacts your trips might have on the world.
since i am very much a happy home body type of person i'm also very happy that others make the trips, take pictures and talk about what they see and do and then i can see those myself without having to go and be a risk to myself or others (i'm not the best coordinated person so it really is better if i don't do a lot of expeditions). that said, i do love swimming and kayaking and i don't do enough of either these days.
questions of balance. over 8 billion people doing things and some of them destructive, how much can any ecosystem take and survive? i don't want to be the tipping point and at times i do try to be the reverse in being encouraging of diversity and trying to remove invasive species. the roadways and edges of farm fields here are full of thistles.

i have a lot of gardens with rocks. do you know how much work is involved in keeping thistles from growing between rocks? [to get rid of them the easiest way is to let an area return to the climax forest - which gets back to the thread title and is not really the answer a gardener who likes beans wants to hear, but any of that will happen long after i'm gone]