He needs to be held to account for inciting racial hatred and in some cases, lying to do so. In the UK we actually have a law that would make some of the stuff he's said in his campaign speeches illegal (not that we're particularly good at holding our politicians to account either). 

I believe the phrase that best describes this particular scenario is "leading by example":

http://www.huffingtonpost.com/entry/donald-trump-racist-examples_us_56d47177e4b03260bf777e83

http://www.bbc.co.uk/news/world-us-canada-35041402

If you condone physical attacks on immigrants, peaceful protestors or minorities, then people are going to think it's OK to keep doing these things.

They now have a strong voice in the President. More racists who previously were quiet will now lash out in public. Not that things like this didn't happen before.
I read a comment from someone who returned to LAX airport during election night.
This probably isn't related to Trump winning but it's still upsetting to read. Here's an excerpt:

"I landed around 4 PM at the airport, so the elections were still going on, and I already was nervous about the outcome. The officer, then opens my passport and says to me, " You are yellow, and Asian, how do you even have a US passport?" Mind you this person was a Russian born American with a thick accent. I felt insanely appalled at the racist and ignorant remark, especially from another AMERICAN. I then said, "I was born here in America!" He then laughs at my face and says, "Funny, and it says you were born in Oklahoma, how is that possible?" By this point I was sure his bigot and racist comments stemmed from poor education, of course ignorance and even hate towards Asian Americans. I then say, " As an American citizen, you are treating me less than an animal! You are a citizen as much as I am one, and I was born here, how dare you!"
He continues to laugh, then asks me why I was in Sweden. I tell him that I was a guest at a convention, and he then tells me, thats insane, I must be doing something illegal there, and goes through my passport."

Looks like she deleted her post since then so I can't quote the whole thing now.

I'd wait until the official crime figures are released to say either way.

People said the same after Brexit and in the weeks that followed racially aggravated crime had risen by up to 60% YOY. 

They now have a strong voice in the President. More racists who previously were quiet will now lash out in public.
I read a comment from someone who returned to LAX airport during election night.
This probably isn't related to Trump winning but it's still upsetting to read. Here's an excerpt:

"I landed around 4 PM at the airport, so the elections were still going on, and I already was nervous about the outcome. The officer, then opens my passport and says to me, " You are yellow, and Asian, how do you even have a US passport?" Mind you this person was a Russian born American with a thick accent. I felt insanely appalled at the racist and ignorant remark, especially from another AMERICAN. I then said, "I was born here in America!" He then laughs at my face and says, "Funny, and it says you were born in Oklahoma, how is that possible?" By this point I was sure his bigot and racist comments stemmed from poor education, of course ignorance and even hate towards Asian Americans. I then say, " As an American citizen, you are treating me less than an animal! You are a citizen as much as I am one, and I was born here, how dare you!"
He continues to laugh, then asks me why I was in Sweden. I tell him that I was a guest at a convention, and he then tells me, thats insane, I must be doing something illegal there, and goes through my passport."

Looks like she deleted her post since then so I can't quote the whole thing now.