Everyone is certainly entitled to lock themselves away in their house for 18 months straight, if that's what they feel they should do. However, don't expect your disapproval of the behaviour of others to actually factor into their decisions in the slightest. That's just reality. You really should try to let go of that frustration, because it's out of your control. Otherwise, you will continue to be frustrated, as you watch others continue enjoying their travel. Your frustration is your problem, not theirs.
Maybe also try to keep things in perspective. You can worry about all of those people roaming between regions, but if that concerns you, then you should be far more concerned at the over 50% of Canadians who admitted to socializing over Christmas and New Years. 50% of 37 Million people having dinner with their parents/kids/grandparents are going to do far more to spread COVID than some domestic travellers, or even some international travellers.
People will keep travelling, just like people will continue to see their family over the holidays, just like people will continue to do other things that are not recommended. It will happen. It's not healthy or productive to worry about things you can't control.
Edited: 8:12 pm, January 17, 2021