Europe has its own illegal immigrant problem that has caused its crime rate to skyrocket. if there are any protesters they are paid for because I doubt with the mess that has been created Europeans could care less about America's president.According to your link, the reason it was so poorly attended was because Brussels was on lockdown during the summit.
From your link....................................
Embling asked one of the organizers why only a couple dozen demonstrators showed up at the protest.
“I think it’s, what went wrong is not the good question to ask,” the clearly frustrated organizer said.
The organizer blamed Brussels being on lockdown for the low turnout before Embling ended the interview.
If you want to see some protests against Trump, then wait until he hits London.